I would recommend installing dd-wrt on the 3700.
I have just got the above router but getting a rubbish signal to my computer in my bedroom on the same floor.
I have a D-Link Wireless N usb adapter, is there a better adapter I should look at getting to improve signal?
DD-WRT currently has major performance problems with wifi on the 3700, so I certainly wouldn't recommend that.
I'm using a Netgear RangeMax Dual Band Wireless-N USB on this desktop which is downstairs in the living room, with the 3700 upstairs.
I get 82% strength signal and usually full 300mbps connection speed, though occasionally drops as low as 216mbps.