FIRST OF ALL NEW PS2's ARE $99 and you can probably get that with a game. The slim PS2's are an amazing console because of how ridiculously small it is and perfect to travel with. They're also incredibly reliable, I've been trucking around the same one for about 6-7 years now. I'd rather recommend you a game, though, so here goes...

Man this is actually kind of hard. I'd put it like this:

Killzone 2 - maybe my personal favorite game on the list, I'd recommend downloading the demo, it shows you what the controls are. If you like shooters, this is arguably the best one this generation but you need to play the demo because the movement and shooting are VERY much unlike any other FPS you've probably played. You'll probably also want to change the controls to "Alternate 2" and many people recommend doing this IMMEDIATELY.

Batman - maybe the safest bet. One of the best games of last year, fantastic story and performances, just fun to play. Another playthrough is worth it on Hard to get the trophy and finish off some of the others. The challenge rooms are very fun, as well, there's some good play time to get out of it.

inFAMOUS - just about as good as Batman if not better, also one of the best games of last year. I think the playthrough is probably longer and there's a guaranteed reason to do it again because you can play as bad instead of good or vice versa, and there are ALOT of different missions for a second playthrough if you go that route. Plus all the side stuff and collectibles are feasible to find, the city is MASSIVE and fun to get around grinding on cables.

Final Fantasy XIII - this is actually a very good game. If you're a Final Fantasy fan, though, it might leave such a bad taste in your mouth that you absolutely hate it. It has a great story and combat system, unfortunately other than battles and cut-scenes there's next to nothing for this game to offer you. I'm 43 hours in, winding down the story, and I've enjoyed it quite a lot. But it's a far cry from the top echelon of FF games, no matter what your favorites list is.

Modern Warfare 2 - probably one of the most addicting games ever released, if you get I'll play multiplayer with you. The story's kinda great but short and it loses its appeal after a few playthroughs.

Good luck!