Informix/FourGen Requirements???

Re: Informix/FourGen platform. Can anyone offer some advice. We are currently running a Wyse 7000 3x486 processor SCO Unix machine. All our applications are written in FourGen CASE running on an Informix On-Line ver 5.1 platform. We also run all the FourGen financial applications. We support at most about 80 concurrent on-line users with about 55 concurrent database connections (sqlturbo's). Using Stallion Monitor we find that we have a CPU bottleneck, our disks are plenty fast for the time being (RAID 5x500 meg). We have 50 % of our users in the ame building as the machine, with the other 50 % spread over about 1000km radius using TCP/IP connections. We find that the response is absolutely awful, and have been told, I imagine quite rightly, that the machine we are using is inadequate for the resource hungry FourGen apps. We are therefore about to upgrade but have been offered two solutions: 1) 3xP5 Pentium Corollary C-Bus II machine running SCO Unix; 2) Quad RISC chip Sun, or Quad RISC Data General running S5R4. We are also looking at a future growth of about 20% per year. What we would like to know: a) which platform (RISC or Intel) is the better option both in the short and long term; b) has anyone running FourGen apps out there found a hardware solution offering sufficient response; c) what platform/technology is correct for the type of system we are running. Other points to consider: i) upgradability of Informix to ver 6 or ver 7? ii) hardware increasing network throughput? iii) obviously price/performance. We would appreciate any feedback before we commit to a purchase. Thanx - Greg ;-)