The VGA->Cat5 adapters are not just moving the wires around. There is actually some kind of encoding and decoding going on there. I don't know exactly how it works, but a cat5 cable has 8 conductors where a VGA cable has 15. The real problem (potentially) is that you have to make those two jacks connect directly to each other without going to your router. As far as quality, as long as you are within the range spec and have decent cables, you should be fine even if you have some electromagnetic fields to go through. Cat5 cables have twisted pairs that help cancel out that kind of noise. As long as the adapter uses them appropriately, you shouldn't have problems. To be fair though, I've never used them and they look on the pricey side. If it were me and I was going more than a few feet (VGA cable length), I would go the HTPC route as well. BTW, there is one other option I have used and works ok. X10 sells those wireless video transmitter reciever pairs. I've used them to play video games on a tv I couldn't see. Messed up, but it worked and looked fine...as long as the microwave was off.