all 3 versions of the WSOP for the psp are great texas holdem games for the psp, of coarse the AI in the 2008 version seems to be the best. are really good on the PSP. Of coarse nothing beats playing a live game at your buddies or at the casino, but it will feed your texas hold'em fix either way.
those are the only good texas hold'em games that i liked for the psp.