What Rev is your 655? A?
Rev Bs are 12v 2A. I presume Rev A could be the 5v.
All the routers i've tested, really haven't had any issues with any of them. I'll save my opinion for about the DGL-5500.
I've enjoyed them all, even the 655. For a comparable 655 class router, I've enjoyed the 645 greatly. Good little router. The DIR-857, 827 and 826L are routers too for gaming and media. Only fault there I see is that a printer is not supported on the USB port on the 826L. Not sure why. I don't use the USB ports for printing anyways and prefer a LAN cable supported printer.
Both the DIR-865L and 868L routers are phenomenal routers. My 865L is back on line currently. I'm glad D-Link added full bridge mode. I had a friend of mine get 2 868Ls for his gaming system so we could connect AC mode for gaming. Awesome now. Had my roommate running the 868L in bridge mode while testing different routers out. Works great in bridge mode.
I posted a review for the 865L and 868L in there forums for your review pleasure.
Been testing new things. Change maybe in the wind here though.
Let us know how it goes...