Upgrading from my GT230

Another vote for HD 5770

+2 5770

Go for 5770
It performs great at 1920x1600


GOOD LUCk

^+4
 
HD 5770

so I take it the 5770, is a good card? I found this one

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

but my only concern is that my computer case is a little tight

http://computershopper.com/var/ezwebin_site/storage/ima...

I will get rid of the modem and the wifi card so there is more room, but will I run into any other problems?

my bad its this card

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

The card isn't that big(8-8.5"), I think it should fit fine.
The card will cover one of your PCI slots but the other should be ok so you can keep the Wifi card. Who uses a modem any more anyway?
What kind of CPU is in that thing?

its a core 2 quad 9400, and 8gb of DDR3   its a really great system for $800, im just looking for a little more oomph in the gfx department.

Yeah, get the HD5770. If your resolution is under 1680x1050 you may want to consider saving some money on a cheaper card however.

what about this card?

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

it a 1x height card which would be nice for me since I'd have to pry out the metal covering for a 2x card, and I only use HDMI anyway, and does my computer have an extra 6 pin power connector? my current card doesn't have one and i wasn't sure what i was looking for when i took out my modem and wireless card today, is it that extra white plug up by the cpu fan? again, I'm a total noob at this new stuff, (my last computer had a fx5200!)

Taking off the metal slot cover is not hard so I wouldn't make that a deciding factor but it looks to be the best price on newegg anyway so I guess you might as well.
The cards usually come with a 4 pin to 6 pin converter if your PSU doesn't have one. It should be easily spottable in the pix on newegg and that card has one.