Should I replace fx 5200 with ati 9100?

Here's what happened: A few weeks ago I bought a Geforce FX 5200 128 mb at a local computer store, it came to about $170 (Canadian) with tax. I know this isn't the best card but I didn't have the option of buying online back then, and this was the best card in my city that I could afford so I bought it.

Then yesterday a friend offered to let me use his credit card so I searched online and found a Canadian site with some really good deals, I can buy the Radeon 9100 128 mb for $105 CDN. My question is, should I buy it? Will a 9100 be a big improvement over a 5200, or will the difference be negligible? After I get the 9100 I would sell the 5200 to the local computer store, I figure I should get at least enough money for it to cover the price of the 9100. Basically I am looking for a card which will give at least decent performance in games for the next year or so, but I am very low on money.

My system:
Athlon XP 2200+
MSI K7N2 Nforce 2
256 mb ddr
Windows 2000

Oh and another thing... The manufacturer of the 9100 is Connect 3D which I've never heard of. Is that a good company?

http://www.connect3d.com

The 9100 would be an improvement of up to say 30-40% faster unfortunately i have not heard much about connect3d.

I've heard and seen connect3d products around on different websites, but I don't know much about them.

Make sure the 9100 isn't underclocked below specs. The no-brand GF2 I had was like that.

If you buy it as a Built By ATi you should have any issue with under clocking and should run to specs.

Yes, but the 9100 in question is mfr'ed by connect3d and not ATi.

Connect 3d is an OK company and should offer a pretty good improvement over your FX