I was in a similar position this week too!
I have been looking around and found out (I could be wrong)...that the higher speed routers will only work if you have the equivalent on your system.
Therefore if you are using Belkin's High Speed Mode ADSL/Router your all your laptop/computers will need the High Speed Mode Card/USB adaptor fitted. If going one step higher using Pre-N, the same applies. Buying one of these routers and making no provision on your laptop will just make it operate at standard 54Mbps.
I decided the i didnt need such a high speed transfer between the networked systems and just ordered the standard ADSL Wireless Router. Still waiting for it to arrive so cant comment if i was right or wrong!!