Okay I'm using TP-WR841N with DD-WRT. It's working good so far, Didn't really see any signal drop.
Overall, love the utility/GUI provided by dd-wrt. I wanted to restrict access on some sites based on mac/IPs and some other stuff too, which I'm able to do with ease.
Was not easy setting it up in the beginning but got the hang of it finally. Too bad it doesn't allow overclocking (I'd love to try for a while haha) on my hardware.
Thanks for the help guys.