Just two additional points.
1)If you made this thread, you worked out your whole issue with GT or a better proxy?
2)Even though, you don't know much about router just keep your eyes on these pages
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Xbox Compatible Routers
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Incompatible Wii Routers
This way atleast you don't buy a router that wouldn't work anyway.
And also just as a head's up if you want wireless on the 360 you also need to buy a wireless adapter which still runs 100 bucks or so if I remember correctly.
Or if you have a laptop/desktop that could run on a wireless network, you can do a bypass which I use.