Should I upgrade my hardware?

I have a model 400-2132.  My disk utilization is near 75% so on the way
to buying more disk I'm thinking this is a good time to look at buying a
whole new machine. (Yes, I have taken measures to reduce what is
occupying my disk).  My local vendor reccomends going to a 600-2135. 
This is very nice, and the performance improvement is 68%.  The cost of
the upgrade, with the increased disk, comes to $40,000.  We are a small
company and this is a lot of money to my budget.  Regardless of the
hardware decision, I will be upgrading from V3R7 to V4R3 or whatever
they are at by the time I get the money :)  The other motivating factor
is that right now I am dialing out to the Internet with a SLIP
connection.  As I understand it, with a V4 operating system I can
connect using PPP but only with the new hardware.  Another consideration
for the decision is that I can't upgrade every year.  Maybe next year
there will be an even cooler machine that I will want?

Anybody have thoughts on what I should do or what additional factors
might influence my decision?

Alan Novick
New Brunswick, NJ

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