What card should I get?

This would be your best choice imo;
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Is that a Pentium D or a Core 2 Duo?

Oops, my bad. It's Pentium D. I don't knowanything about the processor other than it's dual core at 3.4 Is it a good proccesor?

I was actually thinking of the Nvidia GT 240. I don't know much about it, but it seems to be a good card. What do you think?

The HD5670 is significantly faster and DX11 compatible with a number of other superior features. If you can afford it then it is the way to go.
Your Pentium D is kind of outdated at this point. It will limit you in the more CPU intensive current games.

Ok, i'll try for the 5670. Is the 512mb 5670 crossfire compatable? Also, Sapphire or XFX 5670?

Yeah, it's crossfire compatible. The card I linked is the best deal around at the moment and the one I would choose.
BTW if you would like to upgrade your processor you can do so fairly cheaply. Something like this would be good;
http://www.newegg.com/Product/ComboDealDetails.aspx?Ite...
The processor has a much more advanced architecture than the Pentium and it is actually a quadcore with 2 cores locked. The motherboard allows you to unlock the two extra cores. It isn't guaranteed to work but the odds are good(about 80%.) It's also a DDR2 so you won't need to buy new ram.

Your processor is... ok... maybe, just.

As for the graphics card, it suits your CPU, if you did upgrade your CPU it would mean you could get better cards that wouldn't bottleneck as much on your CPU however theres extra cost in this.

That CPU/Motherboard combo seems decent, although I've myself actually never seen a Biostar mobo... atleast I haven't heard anything bad about them.

Ok, so not a recommend OC mobo, but enough to get the job done at a good price, will keep that in mind in future.

Nah, they can OC just fine. They just in general focus on mid-low end segment of the motherboard market.

Do they have many OC features (can you list)

~more off-topic nonsense  

What do you mean by features exactly? Either the motherboard lets you OC or it doesn't.

Yeah, but RoG include probelt etc

Pentium D... aren't Pentium Ds socket LGA 775?
how old is your system?
if its not too old maybe you can upgrade to a Core 2 Quad or something that is not as outdated but still gives quite a performance
if your system is around 3 years old or something you may want to start thinking about saving for a whole new system...

Yea, it's about 3 years old. It's not really a gaming system, but i'm kinda making it one lol. I think pretty soon i'm just going to get a new mobo, cpu, and such. Just start from scratch really.

Best answer selected by imanoob93.