It is really hard to price a system like this. Alot of it really has to do with what you, the seller feel that it is valued at. Personally I would think that Curtis' figure is pretty close to what you might be able to get out of it if the right buyer comes along. Like you mentioned, parting it out might get you a few extra $$ but is also a pain to deal with(trust me).
If I were looking to buy a system like yours with what you have listed, I would probably try and find one in the $600-$800 range.
Hope this helps.
Garrett