To get it to act like a router instead of an AP you need to piggy back off the DMZ of the sr-101 (or put the sr-101 into modem mode if this is possible?, it is with virgins superhub). But you could have done this with your existing router and if you had loaded Tomato USB firmware onto your current router you would have had all the functionality that the ASUS will offer +more.
I have spent so much time messing around with the Netgear I have just about given up. I get the kids everyday saying the wifi is down or very slow, the Time Machine stuff just doesn't work very well (primary reason for buying it). So it can go up on the Bay, the Asus seems to have got some great reviews and Merlin is fixing the bugs that are found and adding some useful functionality based off the ASUS code...