What hardware are you running on?

Ok im about to start this process next week after after reading about all the nice little problems your all having I have decided I dont want it on one of the production servers at the moment at least and not at all if possible.
I have a spare server licence and a spare Dell SFF GX260 2.0 gig P4, Gig NIC with a Gig of ram so i was thinking of running on this as I can just shove it on a shelf in my rack.
I will probably stick in a new HD as well. Any thoughts?

We're running it on an RM Accelerator PC, 1.8GHz, 1Gbit NIC, 1GB RAM and a 40GB HD, though I think we may need a bigger one at a later date. Haven't had a full room test session on it yet though.