Hi, I'm a contractor that works with the new system daily, so I'll give you my 2 cents.
It is a G router, not N unfortunately. But internet speeds aren't anywhere near G yet, so unless you're gaming or transferring large files between computers, i think its a moot point.
MTS is not responsible for setting up your router, but some installers will anyway. Most likely not, with it being mac. That scares a lot of them away. Google "MTS 3rd party router" and look at the first result. That should help you a little. I think the "Airport Admin" program (under applications, then utilities) or whatever its called has a setting called "Bridge mode". Put it to that, and also try and change the IP of the airport to 192.168.100.200
The MTS router will work wirelessly with the touch, and it should work with your existing router, but you could probably just pack away yours for now, unless yours is N and you are set on still using it.
HTH! Good luck