Yup.
Athlon XP 1700+ @ 2400MHz ($45 from the FS/T forums here in August 2003)
Radeon 9700 Pro ($200 from the FS/T forums on another board in August 2003)
and now - Geforce 6800GT ($337 from Provantage in July 2004)
I have been thinking about upgrading to an A64 system, but given how much my current CPU is overclocked, I'm not sure I would see enough gains to justify spending over $300. 🙂