Express Action Sports

I Love Games that give you Loads of weapons, which provide many ways to get rid of enemies and what not. I prefer games that have Rocket launchers, Handguns, Rifles, Shotguns, High-Tech Weapons, Grenades, Automatic Pistols, Grenade Launchers, and just about everything in between And Beyond. Games in which you could upgrade guns are most preferable. Like upgrading Capacity, and Firepower, and all kinds of other things that would make a weapon better. I have always enjoyed "Resident Evil 5", and all the other RE games growing up, before getting my Xbox 360 ELite about three months ago. I like "Assassin’s Creed", "Grand Theft Auto series", "Tony Hawks" Video games (Tony Hawks are a sports video games), "Dead Space", and others. I dont like video games where you cant see the character, because all you can see is in front of the character, and everything adjacent to him/her. (And the way the screens bounce up with the character, when he is supposedly "Jumping"? Ugh!). I’m stuck on a part in "Dead Space", I’v Beaten "Episodes of Liberty City", Beaten the hell out of "Resident Evil 5", and mastered everything ("Dead space" being the exception of course). What kinds of games would provide the type of thrill I’m searching for? Also Games with weapons like Swords, bats, and Knives are still really cool! I just want a game that gives me different ways to get rid of the enemy.
I love games that have hard enemies, so I can have a challenge each time. I dont like games with super short storylines, ones that only take three weeks to beat. Part of my thrill is having a limited amount of space to keep items in, so that Its even more challenging! Finally, games where you can Go to a type of store to make purchases are among some of my most prefered styled games.
Again, I’d Prefer a game where I can see the charater themselves, and not just the actions they’re performing. Remember, I’m a hardcore Gamer! I’m Looking for something truly addicting.

modern warefare 2 (it has 3rd person shooter modes online and all the customisation your after)
mas effect 1 and 2 (multiple weapons and powers to kill enemys)
fallout 3 (free roam, weapon colecting and customisation)
borderlands (its cartoony and free roam, not played it myslef but has a lot of customisation weapons)