I would get the WRT54g-tm with DD-WRT pre-installed. There are several on ebay now. The-tm has 32 MB memory and 8 MB flash that's a little better than the v2.
I have two of them that are now 4 years old one is the AP the other is a repeater. Both have been running at 200 Mhz the whole time. They both have -9dB antennas and I have complete coverage in the house, yard, and garage.