IT'S A TRAP!!!
That guy is a con-man! He is selling a CD32 he bought on eBay from China for under $150 and reselling it for $500. You can get one from China yourself if you search internationally for CD32 in eBay. They're all new in the box, but they're all NTSC with American PSUs. Most CD32 games are PAL, and there could be compatibility issues with a lot of software because of the CD32 being NTSC. Some people have been able to modify them to be PAL, and you may be able to bypass the problem alltogether with an Indivision scan doubler, but then you'd need to plug the CD32 into a PC monitor (not that that's a bad thing).
For tinkering, you'd still be better off with an A1200 though, or at least a PAL CD32 with an SX-1 or SX32 expansion, but those are rare.
A600s are another option, they're quite expandable these days with a new 8MB FastRAM card and a 020 accelerator in the works. I've upgraded mine with 2MB ChipRAM, Kickstart ROM switcher, 1.3 and 3.1 ROMs, CF drive, PCMCIA Ethernet and SD Card reader, USB keypad, mouse and control pad, and a LCD monitor. I took some pics of it a little while ago which are here
http://www.amiga.org/forums/showthread.php?t=49670You should maybe look into going to one of the two Amiga club meetings in Melbourne, they get together every month I think. I'd love to go to them myself but I'm waaay up in Northern NSW where there seem to be hardly any Amiga users left. There are plenty in Victoria though.