Basically i was thinking to use Keyclone on windows machines and Sinergy to link them both to the Apple (setting the Apple as server and both the PC as clients on synergy). Thoerywise it should work, but no idea if i'm right. Actually i'm typing from a train going back home and utill i'm back cannot do any test. Btw, some further infos. The machines will be wi-fi linked on a private internal LAN (wich is what i use to play everyday).
About budget: basically i wanna test my skill managing groups before thinking to any hardware upgrade. Once everything will be tested and confirmed i will buy the 2 copies of the game i need more to make a 5 toons team and the machines required, but i don't wanna do it in advance, so i must try to work with what i have.