if your getting a pre-owned piece from a quality company, i wouldn't worry about it. I've got some amps at the house that were made back in the 90's. Still going strong. I havent done anything to them put plug them in..
yes, after tim the Capacitors may need to be replaced. However, this should not be too expensive. Not necessarily something that would need to be done immediately.
I've bought amps off of both Ebay and Audiogon. Personally, i've had good experiences with sellers selling high end equipment.
On a side note, I've got a Marantz amp in my bedroom. That is another brand you may want to consider. You should be able to pre-owned 2 channel within your budget.
Good luck!
