OK. Either you don't like that I asked or I asked poorly (mybad). So I'll try again.
I have 1 running system Q6600 (= used parts if resold).
PARTS on hand for 2 other systems (Q9950, i5-2500K) (= NIB if resold) as these are not assembled. (Been busy with other things.)
Trying to select the ONE to sell, (WWYD?). Becomes the converse question, if it were you, which 2 would you keep (both new, or used+new& which new)? Would sell at least CPU & MB, possible some Mem.
One system for me, One for wife & young kid, all non-gamers by gamer standards. Reasonable overclocker, not extreme.
Trying to maximize performance & budget so I ask.