I bought something from doctorq once and he was up-front about the condition of the hardware so he is honest. Enough of the badmouthing around here, TjLazer is right about used hardware (i.e. I wanted the chips). Caveat emptor, the stuff is *at least* ten years or so old now. Be prepared to spend money to repair stuff, especially failure prone equipment like A4000Ds and A3000Ds with leaky batteries or DCE CyberstormPPCs with bad chips (JJB is the only guy I know who can repair stuff like this, he fixed a CyberstormMKIII I bought that wouldn't boot so he's legit, A1 operation). Of course, sellers should always be as honest and up front as possible, especially given the crazy bidding prices on auction sites for Amiga gear right now.
Back on topic: the only way to add AA or AGA to an A3000 is the C= way (replace the mainboard with the AA3000 or A3000+ motherboards). They exist (though rare) and are drop in replacements with the same form factor as the desktop A3000. Reputedly they work just like an A4000 but with SCSI rather than IDE. Too bad Commodore got cheap in the end when switching over to surface mount technology and released the A4000 instead.
