Router selection

I have issues with my net gear 802.11g and usr 802.11g routers and console gaming. I never get a good connection when i am hardwired into the router, but i can get a good connection when its straight off the mode. after weeks and weeks of tinkering ive come to the conclusion that i need a new router. Not only do i game with 3 xbox, 2 PS3, 3 Laptops (only one is N) and 2 PC's (one hardwired, and one with ausb 2.0 "g" wireless adapter), but i also download around 150 GB a month (with a 10mbps connection what ever is used to rate internet speed i cannot remember the abbreveation) and i would also like to stream HD movies.

I think i am going to buy the DIR-825 but my brother-in-law said frim his upstairs, he had a very bad signal downstiars on the "N" band with it. i have read this also in some reviews.

just wondering what you guys think of these choices for what i will be doing.

i am looking at a few D-link routers.

these are them:

DIR-628
DIR-655
DIR-825

anyone have any opinions or personal experience with these?