You're not going to be disappointed.
The Xbox 360 is THE HD console of choice (I own a PS3 and a 360... sorry to say this... but my PS3 is collecting dust).
If you're a Nintendo fan, you're gonna love the RARE work:
Viva Pinata
Kameo!!!
Perfect Dark Zero
Banjo-Kazooie Nuts&Bolts
Viva Pinata 2
and the original N64 game: Banjo-Kazooie
You'll also fall in love with Braid. I'm betting 1000$ on that.