Mint 64C for Prophet64... and I just acquired one NIB, so I'm happy about that! :-) I was also happy to pay a "reasonable" price for it, considering I've seen a few go for over $200 on ebay lately. (Which is totally ridiculous for any 64, IMHO.) In addition, I picked up a new 1581 drive kit, so that's pretty cool.
Also on my list:
C128D
1571
A500+
A600
And a few custom chips (both amiga and 8-bit) for some other projects I'm working on... one of them invloves a mint A500, an Acard SCSI-IDE converter, and an old GVP A530 Turbo I have laying around. I picked up the A530 for free, and it works, but the casing is trashed so I'm not sure what to do about that yet.
BUT... to be honest, anything I buy at this point would be simply for collector purposes, mostly to sell at a later date. I'll keep my first few computers for sentimental reasons... everything else has (or will have) a price.