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Sum, if storage is your issue have you considered turning your old system into a Server? If your not fluent in Linux, Microsoft Server 2003 or 2008 for Small Business run pretty strong or you could even use Windows Home Server which is based on Server 03 and 08 and can serve for backups and file storage. I found a 4 bay, hot swap capable, drive system that mounted inside my tower for about 60.00 and it's been great. You could even use a KVM so that you can use the same Keyboard, Video and Mouse for both systems.
Just a thought.
RM
I've dabbled in several variations of this idea RM. Storage is no longer an issue... for now. And Win7's home network stuff is good enough for my needs. Eventually I'll move to a NAS, but for now that's pointless money being spent when I'm the only one in the house. Things would certainly be different if I had 5 people trying to access this all at once. Not interested in running a RAID configuration. I'd rather manage each disk individually. And ALL of my information is backed up on either and old IDE drive which I have tons of, or off site at a friend's house. The really important files, all my architecture work, also exists on DVD's and CD's.
clean lines are for architects and other rigid boring people.
go for the geek cred and build your own water cooled system with a heater core from and old volvo.
That's for people who are 17.
Or for those whom can properly manage the Steampunk Style.