Urgent advise needed aboubt choice of model 400 or 500,need a bit of sensible advise!!!

Hi all,

I have a rare  opportunity of purchasing from the company I work for a
Model 500-2141 128M ram, (no hardrives or ethernet card) CPW 30.7 

the other choice is a Model 400- 2131  (no hardrives or ethernet card) CPW
20.6.

these are for home use --I can get harddrives from my  old model 200cisc
system -so thats not a problem.My question is which one should I
choose????????????
Both will be the same price more or less
Should I bust a leg and buy both?
Whats a fair price to offer? (US market close is close to ours)please note
these have no OS400 ,but this is a rare opportunity to own a Risc system.I
really want these so I need a bit of sensible advise. I have to act ASAP on
this

kind reguards Dave 
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