I'm about to start experimenting with 4 or 5 accounts, depending on performance, and I wanted to get some opinions on what is going to be the best bet, setup wise. I am interested mostly in PVP, aside from leveling to 70 and farming up mount and tradeskill stuff. I want to do alot of AV with the full team, and arenas with all or part of it.

My main system:

Core 2 Duo 2.13, OC'ed to 2.8
4gig DDR2 RAM
2x 7200rpm, 8mb cache SATA2 drives in RAID0 config
8800gts 320mb (SLI is a possibility)
Windows Vista Home Premium (I can switch OS's if I have to)
22" Widescreen LCD

2nd System:

AMD Sempron 1.8ghz
2gig ddr dual channel
Radeon X800pro 256mb (agp)
Single SATA 7200rpm HD
Windows 2000 Pro (Until I can find my XP disk)
17" Standard LCD

I am currently running 1 account on each PC, pretty much maxed out, or 2 one the main PC with one maxed, one min settings. Both work great, I am using Keyclone to pass keys, one copy on each machine.

What is my best bet as far as PVP performance? So far I am thinking 3 on the main, 2 on the alt pc, or maybe running my main character solo on slower pc, and the 4 alts on the more powerful system. Do I need to change OS's or update any of the hardware (I have a limited budget)