15 games that everyone should have played, for <$20

To Andrew: oh I thought it was rhetorical when you mentioned PS3; after you said something about camping I thought maybe that's why you were looking for handheld games. Here are ten games you can get for less than $20 (or if you happen to be my IRL friend, I'm happy to lend any of them if you want to hang out sometime).

In rough order of preference, NO ONE should miss:
1.) Knights in the Nightmare (DS)
2.) Muramasa (Wii)
3.) Vanquish (PS3/360)
4.) Sin & Punishment: Star Successor (Wii)
5.) No More Heroes 1 or 2 (Wii)
6.) Dead Space (PS3/360)
7.) Bastion  (360)
8.) The Witcher 2 (360)
9.) El Shaddai (PS3/360)
10.) Red Steel 2 (Wii)
11.) Shadows of the Damned (PS3/360)

Don't forget the litany of VC classics that I shouldn't need to tell you about. There are far too many to open the can of worms implied by 'best', but 5 absolute MUST-play retro games available for download are:
1.) Ogre Battle 64 (VC - N64) / Ogre Battle (VC - SNES) / Tactics Ogre (PSN - PSX)
2.) Rez (XBLA - PS2)
3.) Alien Soldier (VC - Genesis)
4.) Wonder Boy III (VC - SMS)
5.) ActRaiser (VC - SNES)

(oh and P.S. to Andrew: I assume Mikey has Skyward Sword, so although that isn't as cheap as those listed here, you should definitely play it)