I used part of my tax return (and traded in my DS/games) and purchased a PSP.
So I've been playing Castlevania: The Dracula X Chronicles. If you're a fan of the series this is pretty much a must buy. The main game is a 2.5D remake (3D Character Models and backgrounds on a 2D sidescrolling plane) of Rondo of Blood (the Original RoB from Japan, not the Dracula X version that was released for the SNES in the States), however after meeting certain conditions in the game you can unlock 2 other games. The first one is the original Rondo of Blood (fully translated into English), and the second is a port of the Japanese Version of Symphony of the Night (also fully translated into English with new voice overs and a different script) which includes both Richter and Maria as playable characters once you've beaten the game once.
I'll say it flat out, the remake of RoB is hard as Hell. The game has multiple paths and alternate bosses for stages...I've been stuck on Alternate Level 5 for a few days now. So I alternate between trying to beat that stage and playing SOTN. The controls on the remake are a bit hard to get used to as Richter more of less walks and has no double jump. Thats my only complaint really, but its livable and makes the game more challenging.
A Shot of the Rondo of Blood Remake
A Shot from the Original Rondo of Blood
I'm really enjoying it. 3 games, all of which are fun and challenging, for $29.99 is a damn good buy as far as I'm concerned.
On a side note, if you consider getting a PSP here's what you should do. Look for a PSP Bundle called the 'Daxter Bundle'. It comes with a Silver PSP (the newer Slim PSP), A 1gb Memory Card (normally sold separately for $34.99), the Daxter Game (I've played it for maybe 10 minutes, its an ok platformer so far), a Family Guy UMD with 5 episodes, and of course the AC Adaptor and Battery...all for $199.98. The only other bundle I saw was a Final Fantasy Tactics Bundle for the same price but it lacked the Memory Card. The PSP has got quite a large library of games coming out for it now, so its definitely worth the buy.