Ok, first off, dude: paragraph breaks, please.
Personally, from my short time playing Halo Reach and the original Halo, I find that franchise incredibly dull so IMO I'd dump ODST and Reach altogether. From there, I'd recommend...
1a. Metroid Prime Trilogy IF you haven't already played the three Prime games or if you just haven't played Prime 3.
1b. Bioshock 2 - Highly underrated.
2. Portal from the Orange Box. Set the rest of the Orange Box aside for when you have more time and interest, but Portal is a must.
3. Call of Duty Black Ops if you haven't already gone through that one.
4. Left 4 Dead 2.
5. Dead Space Extraction.
Of course, move items and and down the list as they strike your fancy. I don't care much for games that practically require co-op for the true experience, so Left 4 Dead 2's not high on my list but it could be more important to you.
As for the other items you spewed out there at the bottom, I'd prioritize those as follows:
1. Uncharted 2 - great game, and a huge upgrade from the first one.
2. Final Fantasy 5/6 - If you haven't played these yet, you should. 6 is a classic and 5 is quite fun.
3. Shatter - A great game to play in small doses and quite addicting.
4. Vanquish - Haven't played it, but it's had decent reviews.
5. No More Heroes 2 - Not all that great IMO.
6. Scott Pilgrim - The movie is something special. The books are something special. The game is not. It's not terrible by any means, but it's not particularly memorable either outside of the music and nice visuals.
7. The music games - Not my thing.