Forget about the standard A1200 power supply. Just make or buy one of Amigakit's PC p/s adaptors and plug that into your A1200. Then as you expand you won't have to ever worry about power inadequacies (and you'll be able to power external cdrom conveniently). This requires you finding an old PC AT supply, of which there are millions in existence.
@tonyvdb
The 3000 is tight for expansion and the 600 isn't? hmmmm...
I recommend an A3000 over an A1200 if you can find one with at least 8MB of internal zips already installed. It's a real computer case with built-in vga monitor compatibility, Zorro III busboard for later adding an rtg graphics card, ethernet, fast serial cards, etc. and may be actually cheaper second hand than the A1200. If you add an rtg graphics card, you may not even miss AGA games at all. Many of the better ones had rtg versions.
