Bupkus: No, I foolishly purchased mine when they were considered high-end hardware back in early '02 for $170 at Best Buy... 🙁
As for the overclocking tool, I use nVHardPage from Guru3d's list of tweaker toys; it's pretty feature-rific and incorporates the Coolbits overclock hacks. Unfortunately, my case isn't well cooled at the moment, so my card just can't top 265/545 without stability or artifacting errors, and even with this "stable" configuration it'll start doing weird things once the GPU heats up (ie, after about fifteen minutes of Halo)... Your mileage may vary, though, hopefully for the better. 🙂 Oh, and Max Payne 2/Halo don't work if you hardwire AA/AF, so leave them disabled/automatic in the nVHP settings if you want to play those games.
And regarding overclocking: Why not? If you can take it to Ti4600 speeds safely, why wouldn't you? I didn't notice any phenomenal speed gains, but then again, my gaming consists of AvP2, Half Life 1, some UT2k3 botmatches, and very rarely Halo. (Note: Once you enable hardwired effects like AA/AF, you'll see less lag in maps like Auriga in AvP2; I'm not sure if it's just my machine or some weird Twilight Zone effect...)