i'd agree with Chubbyrain - a 128D (*NOT* the DCR!) in mint condition would be my fav.
i've got one of the first 128D in my collection (from ebay), but with the floppy missing and a slightly broken case (the plastic hooks at the back are broken)...so it isn't mint at all.
i'm used to play NeoGeo MVS (arcade-PCB - own a lot of boards and ~20 carts for it), so another nice one would be a NeoGeo AES (Home-Console) in good condition.
best catch ever was a Wizard of Wor arcade-pcb build in '81 in a very good condition. looks factory new! but the price i paid was...well ~300EUR. but it was a "must have".
hell, it was pure hell to located a dealer who would import that one for me. found one here in germany - he received it from the UK, traded some other PCBs for it. was quite an act - whole transaction (searching, trading, etc) took about 5 or 6 month. but looking at the age of the PCBs and the cage it was worth it. 24 years old and looking like new - and, what else, still functional.
