Just took the plunge and setup my 5 box a few days ago. I bought Keyclone - well worth $10 I have to say.

I have a quad core intel overclocked to 2.7 ghz with 6 gigs of ram and Vista 64 bit ultimate. I also have two 30" dell monitors and a Nvidia 8800 GTS. 4 Wow directories are running off an external SATA drive. (I notice some of the instances of Wow lock for a few seconds every once in a while - I wonder if this is a drive issue)

I currently have a level 70 shadow priest and a level 70 fury warrior that I played before I knew about boxing.

I just started boxing a couple days ago (level 22 already!)

1) Paladin
2) Shaman
3) Mage
4) Priest

I have keyclone running maximizer to put all 4 wow windows on 1 of the 30" monitors (each using the processor affinity). 1 screen on the top portion for my pally tank and 3 on the bottom portion for the ranged.

I figured that I could use my warrior as a main tank once all my other guys got to 70 - so that would make a group of 5. Then I came across a post that showed how some fury warrior helped level a guy just through instances in like 1day 22h.

So my question is - should I just have my 70 warrior be the 5th man in the group and just blow through instances?