have a question with speed of routers.

Hello ALL

Im a newbie here.. So please be paitence with me
I would like some opinions/advice/information to help me in what router shall I buy.
I was thinking of buying Linksys EA4500 or Linksys E4200v2

but just wanted to get some info..
Current I have hardwired to my router are:
2 desktop PC
1 xbox360

wireless
3 Laptop,
4 mobile, 1
1 xbox (1 hardwired other 1 is wireless)
1 wii
1 playstation 3
1 ipad

I am Looking for a router that will give me maximum connectivity speed also maximum range as this router will need to cover a large area.. 2 houses infact..
and some of my devices is old. i.e laptops so they can only can run on G

so my question is.. what is the maxium speed can I get for a G band and a N band router... and what router would you recomened. I live in the uk and Im on a DSL connection.

Thanks