Kohlberg Kravis Roberts & Co.'s $25.6 billion buyout of First Data Corp. (NYSE:FDC) won't hold the spot of the second-largest buyout for long.

Tthe top-ranked $45 billon TXU deal, which also includes KKR, will get eclipsed as well.

There's bound to be another mega LBO sooner rather than later. KKR, The Blackstone Group and Texas Pacific Group all have billions of dollars burning holes in their pockets.

What people seem to be forget is that these firms don't want their investments to remain private forever. Odds are good that investors will get another shot at buying shares of First Data in a few years. Maybe then being public will be back in style.

First Data should thank its lucky stars that it's being acquired by KKR.

Growth at the credit-card processing company has been slowing since it separate its Western Union payment processing business and has struggled to find a chief executive to succeed Henry C. "Ric" Duques, the Wall Street Journal said.

Duques who returned in November 2005 after his successor Charles Foote announced his retirement for "personal reasons." At the time, Duques agreed to stay for about two years to help the company find a new successor.

Investors have sat on the sidelines while First Data searched for new leadership. Its stock tanked more than 40 percent over the past year even though most Wall Street analysts rate it either a buy or a strong buy.

Analysts had said First Data would make an atractive buyout candidate for private equity. My colleague Georges Yared makes a persuasive case that the company's prospects are good.

In addition, First Data stands to profit handsomely from the private equity boon. All of those credit card purchases by investment bankers of first-class airplane tickets, suites at fancy hotels and expensive bottles of wine have to be processed somewhere, no?

It must be something in the water, but Blackstone Group LP's workers produce nine times the profit as their counterparts at Goldman Sachs Group Inc. (NYSE:GS), according to an analysis by Bloomberg News.

Blackstone's 770 workers produced an average of $2.95 million in net income last year compared with $360,000 at Goldman Sachs which has about 31,000 workers, Bloomberg says. This raises some interesting questions about how the market will value the New York-based hedge fund company.

If investors value it like Goldman, it will trade at about 10 times earnings with a market capitalization of $23 billion while a Fortress Investment Group LLC (NYSE:FIG) multiple would value Blackstone at about $29 billion, Bloomberg News says. Goldman's market capitalization is $87 billion and Fortess Investment Group's is $37 billion.

Blackstone, though, will trade at a premium to both companies -- at least at first -- because its performance has been amazing over the past few years.