Pre-order Little King's Story (and get a free stress doll to boot! It's about twenty hours, though...).
The supposedly pretty good Tenchu IV is only $16 right now.
Klonoa was fantastic on PS1, and the remake is supposed to be just as good (only $30 too)
Buy a Wii Points card and go nuts with WiiWare (If you liked Sam and Max, Strongbad is great. Also, there's an entire World of Goo to explore, and Toki Tori to delve into. And you have to try Pong From Hell, a.k.a. Bit Trip Beat. Plus there's the Artstyle games, and...f***, you could blow the whole load here, if you want.)
Do you not like Resident Evil 5?
I'm surprised you don't have F-Zero GX. I've seen it at a few Gamestops, but it's not very common.
Screw the haters, Prince of Persia was good.
Pikmin!!! New Play Control preferred, but the GC versions are just dandy too.
Rachet and Clank was pretty entertaining.
Trauma Center, especially New Blood.
I'm just realizing there's so many good games that you passed on, which makes me think our tastes are nowhere near the same. =^/
