Actually I purchased this PC for my boss in September 2006, it was worth 27k. When I purchased it back from my boss, i checked market again, they told that at current market price a new like this one wud be 16k so and they told that they would sell something like this for around 11k and hence i got it for 9k from my boss.
I m not criticising ur demand, but just giving an idea so that u may keep in mind that used technology items, PC, Cell phones do not sell for good. I also mentioned up there that DDR RAM are expensive now-a-days bcoz DDRII is the most common available in market and hence raising prices for hardly available DDR RAMs.
I am an IT Manager for a Telecom Company and have a good idea at what prices computer parts are available.
Still best of luck for ur sale. 