If you want a PS3, I suggest you
look right now. Gamestop's clearing out their stock of refurbished PS3's and they're all going for $150 regardless of model. Which means the 60GB PS2-compatible PS3s are free game, too.
You have no idea how much of a tempting offer that is to me. I caved and bought one, so yeah. Today is Powerup Rewards members only, but tomorrow is everyone. Also you get a free game with it and Disgaea 3 is one of the eligible ones.
As for Disgaea D2, I'm really liking it! It goes back to the banter that Laharl/Flonne/Etna had, it gets rid of the limited item bag you can take into battle, you get a LOT more freedom as to customizing generics, the color shop from D4 returns and you get access to it from the Dark Assembly right from the get-go, they improved a lot of the mechanics, there's a bunch of extras like the cheat shop (which lets you lower or increase different gains) and the training room (which affects what stats a character might gain at level up), there's none of the mana shop business anymore from D3/D4-- it's all master/apprentice again with a new twist: You can choose who masters and who apprentices on the fly, allowing basically anyone to end up learning any basic skill, the maps give detailed previews before you go in, it keeps track of a lot more things in the game, and just.
tl;dr: it's a pretty massive upgrade over even D4, and I can't recommend it enough. The worst things in it are just a couple bugs that NISA needs to iron out, but that's about it.