Whats it worth??

[pbmac]

I am looking at a Diedrich IR-3FM with the afterbuner. Its about 4 years old and appears to be in good condition and well maintained. I am just curious as to what a fair price on this machine would be. I know Diedrich's hold their value...and together this is about a $19,000 system...so don't want to try and get the price down if the asking price is already a bargain.

Thanks