Server Recommendation

I’m looking for a server recommendation. We are a small company with about 20 users. Currently we have an IBM PC Server 325 with 130 mgs of ram and 8
gigs of disk space. running Novell 4.11 with Intranetware SBE, Grpwise 5.2,Goldmine, a contact manager, Norton Aniti virus Corporate edition, among others.
Our disk space utilization is around 65% Looking for a bigger box with alot more disk space and to accommodate future growth in the 25- 30 user range .
We plan to run Netware 5, Grpwise 5.5, NDS for NT, because we pam to run Goldmine on an nt box. What would be an optimum server config for network I
described. Thanks so much!