im trying to wrap my head around how this works. house a has the equipment, and then house b has the projector/tv/monitor/whatever?
or is it that house a has the cable/sat tv reciever, and house b has everything else?
my only concern is (since you mentioned gaming systems) that any passthrough device risks screen/controller lag issues
while svga cable used to be a fine choice back in the day, and i know my university runs 50'+ lengths of the stuff all over the place, my personal experience teaches me that its a bad idea due to interference. there are writeups out there of how to get video over that cat5 you mentioned. there are wireless devices out there, but dont trust wireless, as every single kind ive ever had has ended up with some kind of interference.
a quick google shows max cable lengths as follows: hdmi goes up to 50' length or so, dvi only goes about 15-30' depending, 50' for svideo, 300' cat5, and those are all i could find info on with a quick google.