Are you AGP? :D
Is it 4x, or 8x or ....?
I always try the on-sale items at computer store for 'older' but equivalent; no sense in putting out the bucks if you, and you will, update computer at some time.
ex:
Next step for me, far far away right now:
- New mobo as the next generations are:
PCI Express video, although AGP is still out there and new.
64bit cpu, cause the rest is gone.
w/Dual channel memory slots, in anticipation of new ram
w/SATA readiness, although IDE will be around for a while I think.

I've already oversized psu as last supply died.

Something to think about.
and there is this:
http://graphics.tomshardware.com/gra...n_9800-03.html

Edit, and especially for getting 'older' model(yes new):
Get them to make it run in the store, so you don't get stuck with a non-compatible card.

Edit 2, but there is a nice write-up on the card you mention:
http://graphics.tomshardware.com/gra...119/index.html
Add:
- and it looks like the way to go. :D
-- Found 8x, but no 4x.(one of the orange squares at top):
http://www.msi.com.tw/program/produc...il.php?UID=636