This looks really good. Nice physic engines (can pin enemies to the walls with the stakegun, slow motion, etc.). Only thing im worrying about how good of a computer I need, and the MP modes are all somehow centered around deathmatch (Even the People Can Fly mode)
Old Age and Treachery will overcome Youth and Skill.
So take your receipt in and tell them you want the discount. If they balk, bring in the system and "return" it then buy it again for the new price. Usually stores like Wal Mart will just give you the difference.