Prognosticators the world over are throwing in their 2 cents about "my pal Warren's" next market moves; especially since he announced last week that his trigger finger was itchy. When Warren Buffett, chairman of Berkshire Hathaway (BRK.A and BRK.B) speaks, investors listen.

On Wednesday March 2, this investor threw in his two cents worth (see:Serious Money: What Should Warren Buffett Do Next?) discussing possible acquisitions. Since all the "pro's", I use the term loosely, have had a say I thought I would give readers a chance to express some of their ideas too.

Last Friday Warren Buffett said he was anxious to pull the trigger on another large deal -- having only recently completed the Berkshire Hathaway (BRK.A and BRK.B) acquisition of the Burlington Northern Santa Fe Railroad. Since then, prognosticators far and wide have been making suggestions about his next possible moves.

Considering I wrote about the railroads the day before the BNSF announcement, I thought I would share a few ideas, old and new.

"National Grid (NGG), an electricity and natural gas transmission and distribution utility, is a low-risk, income-generating idea," suggests income expert Carla Pasternak.

The editor of High Yield International explains, "Based in London, the company's largest market is still the UK, and it holds a virtual monopoly on the electricity transmission grid in England and Wales.

"Its primary business is to balance the supply and demand of electricity and natural gas and transmit that power from producers to customers across its network of high-voltage transmission wires and natural gas pipelines.

During the second quarter I wrote a series of stories about stocks that might interest "my pal Warren" in the global market. One such stock in the June 24 post was National Grid PLC (NGG), which closed Friday October 8 at $45.43.

At the time of the recommendation, the stock was at $37.81. It was 33% off its high and, besides strong fundamentals, is a company that resembles Berkshire Hathaway's (BRK.A) Mid-American utility holdings. I thought it would be a good fit for further integration and growth of this division, given that both also have British and U.S. enterprises.

Four weeks ago, I made the argument that National Grid (NGG) might be on Warren Buffet's radar screen as a foreign acquisition. The strategic benefits, depressed stock price and yield all made it look like a good fit.

Ten days ago, Barron's trumpeted National Grid, a British company traded on the NYSE, for all the same reasons, absent the merger and acquisition possibilities.

So last week I bought NGG on a dip as a value proposition and if by some miracle "my pal Warren" makes a play for it that would be a bonus. Not to mention my crystal ball would go up in value. If you might be interested in a 7.72% yield from a company with the cash flow to back it up, read on.

Today we expand on investment criteria and start to look at actual stocks of non US companies that might be in the running for inclusion as one of Berkshire Hathaway (BRK.A/BRK.B) foreign holdings.

In searching for global investment prospects that might interest Warren Buffett we have established that newly allocated capital would most likely pursue companies that pay a dividend and make products or operate in sectors that are well established and have a high level of certainty to exist decades into the future. This is basic to "my pal Warren's" investment philosophy, and there is no reason to think this will change.

In Part 2 of this series we then examined the size of a potential investment settling on a general range from $4 billion to $24 billion.

MOST NOTEWORTHY: National Grid, Shire Plc, On Semiconductor and Enbridge were today's noteworthy upgrades:

• Deutsche Bank upgraded shares of National Grid (NYSE: NGG) to Buy from Hold as they believe the Keyspan deal will be positive for shareholders.
• Goldman upgraded shares of Shire Plc (NASDAQ: SHPGY) to Buy from Neutral and added the stock to their Conviction Buy List on valuation and expected gains in the ADHD market.
  
• On Semiconductor (NASDAQ: ONNN) was upgraded to Outperform from Market Perform at Wachovia on valuation.
  
• Enbridge Inc (NYSE: ENB) was raised to Sector Outperformer from Sector Performer at CIBC World Markets, as the firm sees an attractive 3-year return potential as new projects come into service and expects the stock's relative underperformance to come to an end.

OTHER UPGRADES:

• Visteon Corporation (NYSE: VC) was upgraded to Neutral from Sell at Goldman Sachs.
  
• RSC Holdings (NYSE: RRR) and Greenfield Online Inc (NASDAQ: SRVY) were upgraded to Overweight from Equal Weight at Lehman Brothers.
  
• Lockheed Martin Corporation (NYSE: LMT) was raised to Buy from Neutral at Merrill Lynch.
  
• Stifel upgraded Health Care REITs, including Healthcare Realty Trust (NYSE: HR), LTC Properties Inc (NYSE: LTC) and Ventas Inc (NYSE: VTR), to Buy from Hold.