Well,
A4000, because i still can use it for most of the things i need.
I stil use it every day for
internet browsing,chat,wordprocessing,programming etc.
afcource, he's a bit expanded
040@50mhz (warpengine) 64mb, CV64/3d,blit-fixer, ariadne,par,scsi cdrw,zip,jazz,20gb hd,sampler,midi.
and running os 3.9
next would be my a1200 (040@40mhz, 64 mb fast,cd/hd/ethernet)