Think I understand my setup, please critique

Here is the plan, the first portion are resources already available, and the second portion are the resources I must buy/level, and lastly how I plan to set them up, please keep in mind I'm a PvE addict and PvP is low priority. In general I would like the ability to control all at once, or just the tank, or just the priest, or just the dps(together). Oh, and I'll admit I'm not really sure how KM switch works or how easy it is to use.

[Have]
High End CPU
Medium-High End CPU
2x 22" Widescreen LCD Monitors
Many Wired Keyboards (includes G15)
Many Wired Mice (5 button, scroll wheel, optical as personal preference)
Excellent Internet Connection and Networking Supplies
Level 70 Human Warlock (1st Account)
Level 70 Draenei Priest (2nd Account)
Level 70 Human Warrior (3rd Account)

[Want]
3x Medium End CPU
3x 17" Standard LCD Monitors
1x 8-Port Vetra
5x Y-Key
1x RF Keyboard (+2x Dongles)
3x RF Mice
3x X-Keys
Level 70 Draenei Paladin (3rd Account)
Level 70 Human Warlock (4th Account)
Level 70 Human Warlock (5th Account)

[The Setup in Ghetto AscII]
CPU [3] [2] [1] [4] [5]
^ ^ ^ ^ ^
V Z V Y V X V X V X
VETRA
|
K

Key : ^ = Y-Key
V = Goes to Vetra
Z = Tank Board
Y = Priest Board
X = DPS Board
K = The All Board

As far as mice go, I'm thinking 1 mouse for tank, 1 mouse for priest, 1 mouse with 3 dongles for the dps. for the CPU, the 3 identical new bought setups are for the dps, the super rig for tank, medium rig for healing, big ass monitors on bottom for tank+heal, smaller monitors on top for dps

And the question?

While I'm here I should mention, Vetra can't broadcast G15 as that's a USB keyboard. Try to make it into a ps/2 and it's no better than any other keyboard, except that the background lights might work.

Just my available resources there, don't need to use the G15, but I have it if'n I wanna, I s'pose the important question that I'm not sure I understand is, I can use the Y-keys to basically have one go to the vetra while the other goes to a backup keyboard? or is it absolutely necessary to use those KM switches because I can't just take up the backup board and start typing?