Count me in seeking professional help. Up until recently I was almost in the same boat as you, G5 main workstation/web development, G4 running OS 9 and classic gaming system, iMac G5 surfing web, email and streaming net music and an old ibook used as temp file server. Sold the all cept the G5 and G4 recently :-( was sweet while it lasted.
Count me in. Got a G4 MDD as a workstation, an Xserve will be my media server when the damn thing actually decides to run its blowers instead of just overheating, using an iBook G4 (borrowed) to do general surfing and control the other machines when more power is required. That one will be replaced by the TiBook I'm trying to rebuild. I have a host of G3s waiting to be assigned their jobs.