Howdy Rarr and welcome to the forums!

i believe all solutions mentioned in the wiki provide for multiple machine access, with varying degrees of ease of configuration/usability and bannability

i started out boxing 3 machines normally (2 laptops and 1 desktop) on shadowbane running 10 characters at once.

these days i normally 5 box using just my desktop (an amd 3800+ 2.2GHz single core.. 3GB mem and an 8800GT OC) and i'll typically get 5/25 fps in an instance (5/5 in orgrimmar). maximizer across my dual monitors (in horizontal span) & pip swap just look nice (i run 1 x (2x2))

and i use keyclone to handle everything i need (of course)

if you have any questions or comments, please feel free to drop me a PM