Sizing a Solaris 8 box

Hello all,

Our customer is asking us what size Solaris box they they need to buy to run Tamino.

They have approx 40GB of data which is likely to grow to 100GB over the next couple of years.
They will initially have approximately 100 Users (not all working concurrently).

Has anyone done this type of sizing?
What box did you recommend?
How much memory?
How much disk?
how much anything else???

Thanks in advance,
Blair Harding