Yeah, I'd start with the card; if it turns out you need a whole new rig, you can just switch the card over anyways, so you can't lose, but it's pretty much guaranteed that you'll get a significant performance boost from a better card.
Mount And Blade...basically you'd a mercenary captain in medieval Europe, except instead of medieval Europe it's called Calradia, but there aren't any spells or dragons or whatever. You can recruit dudes to fight for you and stuff and go around fighting bandits at first. Eventually you gain some renown and can join a faction and fight for a side in the wars and stuff, eventually you can become a vassal of a king and get your own castle and stuff. The meat of the game is the battles, though. You control your guy from third person, and it's got to be the best melee combat system ever. You attack using LMB and the direction you move the mouse determines the direction of the attack. Enemies do the same and you have to block the right way, which makes it awesome. Also, speed is a huge factor in weapon damage, so if you run at someone and swing it does more than if you're just standing...and if you hit someone from a horse at full gallop...you'll usually fight from horseback and there's nothing more awesome than riding down enemy crossbowman and killing them right before they put a bolt through your liver.
Sorry for the novel. I like this game a lot.
This post is about to get longer: Crysis review
Okay, the graphics are nice.
There aren't enough guns. The SCAR you start out with has no ammo until the very end of the game, so after a half hour or so you won't ever use it again. Other than that, you have; assault rifle, pistol, shotgun, smg, sniper rifle that never gets ammo. I want more toys! Toys are basically the heart and soul of the sandbox, so it would make sense to provide them. The suit powers are cool, but the only one I ever used was cloak...the others seem underdeveloped. Enemies take way too much damage and you die pretty quickly, so you can't play it like a straight shooter even for a little bit. At least health recharges. The enemy AI is pretty good, no complaints there. The level design is good up until the alien ship, but I would have liked some indoor stuff. The helicopters cheat; they can see you lying prone in the middle of a bush in the forest. With cloak on. The aliens were kind of lame, the antigravity was nowhere near as cool as they said it would be, and the whole thing was disappointing. The end was pretty abrupt, too, since it's gonna be a trilogy. Overall a good game, worth playing if your computer can run it, but if not you're not missing too much, just play Far Cry 1.
Currently playing FEAR 2 and Bioshock. So far FEAR 2 is fucking awesome, as expected, but Bioshock is a little different than what I expected. How dare they!