The following things you cannot get: (because im getting them on feb 1'st when the b2g1 starts, which you should probably wait for)
Panzer Dragoon Orta
Magic: Battlegrounds
Sega Soccer Slam
Those were the only ones I saw that had only 1 copy left
I recommend:
A preorder paid in full for Phantom Dust (19.99)
Freedom Fighters
Star wars KOTOR
Crimson Skies
Elder Scrolls 3: Morrowind
Armed and Dangerous (if theres more than 1 copy left only0