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