Well, first you cannot believe the range claims of the vendors, they are willdy exagerated.
Your 100 ft is a long way to go in a house. I'm in a 1930s house of brick and breezeblock. If I go corner to corner I guess its less than 100ft (and through a lot of walls) and I get very weak signal with errors and loss of connection (but thats with a PC card in a laptop).
You might be ok, but If I was you I would hedge my bets and would choose a wireless router with a detachable aeriel where you can add a high gain aeriel if necessary. I know D-Link and Orinoco do these (maybe SMC too), I don't know if Belkin do also. Orinoco have a reputation for good range (but I have heard support is poor in the UK).
Or this from Linksys:
http://www.linksys.com/splash/wsb24_splash.asp
Technically there should not be a problem to mix and match different makes of wireless kit (though there has been in the past).
Hope that gives you food for thought.