It might be an idea to get a Socket A mainboard that supports also 400 fsb AMD Processors. This for future upgrading, AMD has already anounced that they are to build faster one untill at least Q1 2005. Only the Athlon XP 3200+ has a FSB of 400 mhz right now. Whether or not you want to do this, i would get faster memory. ofcourse 400 mhz memory will support the mainboard with 400 mhz FSB, but your A7V8X-X also supports it.
One more small detail on the processor. The Athlon XP from 2500+ and up has 512kb L2 Cache, except the 2600+ and 2700+. Why? I don't have a clue. But it does make a processors faster so maybe its an idea to pay a little more or less to get a proc with 512kb level cache.
And i agree with the other for getting a bigger harddrive. Also have a look at the buffer size of the HD, normal ones ussually have 2MB buffer, faster ones have 8MB. Sometimes a small difference in price but more inprovement in performance.
So much from me, good luck