Q's regarding .11n router

I'm considering setting up a wireless network in my house again. I remember when I tried it last year(.11g), I was not able to get the signal in most parts of my house due to the fact that the modem is located in one corner of the house instead of in the center. It would show low signal in the opposite end of the house, but my laptop would not actually connect. Now we're getting additional laptops, it's time to consider wireless once again.

My question is how much further in range can I realistically expect from N as oppose to G? I know on paper it's twice the range, but I don't live in a lab. Also, does N have the same setback as G? By that I mean if I have 1 system running on G, will all the other N capable systems be limited to G speed/range as well? I'm considering getting the DIR-655 since it seems to be highly recommended. However, do I need the matching D-Link Xtreme adaptor, instead of the build-in N card, in order to fully take advantage of the router's speed/range? Would I be better off just getting a DIR-635 (or another lower cost model)? Sorry, I'm a noob to all of this.

 

The 11n will give you theoretically twice the range as 11b.But many factor come into play with this building materials,devices running at 2.4Ghz, at any rate you'll get better range and there is always stronger antennas,range extender/repeater. Do you live in a big house? And as long as you've N wireless cards in the laptops you'll achieve the better speeds and range provided that you not running in mix mode a/b/n.