IK Gamex welcome to the forum.
i actually currently do this. i take a eathernet cable from my router/modem combo to my wrt54g, and plung it into the wan port, then go into the wrt54gs control panel and change the ip from 192.168.1.1 to 192.168.2.1. and it works great.
i actually ran into this problem on a system that i built for a friend, and fast write was the answer, once i turned it off, fixed everything. i would give it a try and see.
you could do that but it will look like crap, with that viewsonic box i posted it will do post processing to make the video look much better.
this one here has componet built in http://viewsonic.com/products/tventertainment/tvvideoprocessors/nextvisionn5/ but its a little more $$$ and this one will do HD http://viewsonic.com/products/tventertainment/tvvideoprocessors/nextvisionn6/