handheld Texas Hold-em games: thoughts??

anyone have any ideas which are the best no-limit handheld games?? ... and yes, i realize they aren't going to be too robust... just thinking of using them in transit (to work or on airplane) or giving them as gifts. radio shack in canada here (or its new "circuit city" name??) had 3 units, 2 of which were by same company.

anyone have any idea which is the best???

thanks in advance?