If your 040 board is the C=, save up to a CyberStorm 060, its going to cost a bit but is well worth it if you are serious about classics, ~250-350 euro.
CSPPC is IMHO not worth it (if you cant find one for a steal ;-) ).
Its not worth it to expand an A4000 if your CPU-board is a crappy one IMHO.
