Need insight on software I should use.

Hi everyone, I am Ratchet! I am currently working on a project involving multiboxing with 6 PCs.
My build log is over on another website that does not involve multiboxing, which I will not post yet. I want to have the project completed before I start showing off :) The problem I am having right now involves getting all 6 PCs to show up on a single monitor.

Here's a small layout

Master PC running windows 7 + monitor + mouse + keyboard

Headless PC 1 - No monitor
Headless PC 2 - No monitor
Headless PC 3 - No monitor
Headless PC 4 - No monitor
Headless PC 5 - No monitor

What I aim to do is (at worst) *tab* between computers and (at best) would be having all the "monitors" windowed into my main monitor or a second monitor.

The only software I can use so far that can do this easily is Kavoom! . But i'm skeptical because it's not well known and licensing for all my computers comes to around 200$.

I will be using Hotkeynet to multibox.

Basically I need a good soft KVM. VNC maybe?
Help is apreciated!

-Ratchet

So I guess I might be out of luck hmm... Well I'll leave this up until the evening, if nothing comes up I'll delete the thread. Thanks for looking guys! :)
CAn't wait to get this setup going :)