If you want to continue with that card you'll want to make sure there is an available slot for it (PCI I believe)

You may want to weigh the option of 64 bit vs 32 bit. Check the available drivers for that soundcard; see if Win 7 64 bit is supported. If not check Win 7 32 bit. This may be a big deal for the soundcard. Do a little digging for reported problems just as a precaution.

Otherwise, I suggest at least 4 gig RAM, and also at least a dual core processor. If you plan to use firewire in the future check that it has that, and hopefully a TI chipset, as this brand seems most reliable.

As a side note, I like having the HDMI port for larger monitors, etc. It is very handy here. The number of USB ports is to be considered also, as these fill up fast.

Make your sound your own!
.. I do not work here, but the benefits are still awesome