Re: Would this work with infinity?
The N900 (WNDR4500) has far more powerful wireless and processor than any of the others mentioned.
As for the firmware reliability I can't say.
Ultimate® SuperHub2™ Mod©:
N750 Simultaneous dual-band wireless (300+450)
5 Upgradeable antennas, dual-processor, 7 ports
Fully customizeable dd-wrt/openwrt routing engine