It's not easy for me to choose..
But I will have to say: A500
Because it was the first computer that i owned. Used it a lot :-)
Games & Interword with a 24 pin matrix printer.
In the living room I have a CD32 and a CDTV for games and to play cd's. Most people like it :-)
At the desk: A1200D and A4000T, Internet, music and games. And general some messing around just because Amiga are a hobby of mine :-D
Projekts: A1200T, A4000D and A3000D
A1200T, needs a lot of work before it will be done, will be my primary machine.
A3000D & A4000D just needs network cards.
My A500 and A600 are stored now, I will set them up when I have my computer room done.