What is the actual layout of the house? e.g. 65' x 72' x 3 floors works out to about 14000, but I kinda doubt that house is a large cube. :-)
Also, where do the existing ethernet outlets terminate? In the basement? a 2nd floor closet? on a patch panel? on a switch? Is there power there so you could use PoE APs?
There's really no way to tell how the APs you obtained already are going to work until you deploy a few and walk around with a laptop checking the signal and roaming. Personally, I think D-Link makes a more aesthetically pleasing case (e.g. see the DWL-3200AP, DIR-628 and DIR-825, et al); the reason the black and blue plastic Linksys cases 'look' cheap is because they ARE cheap (fairly sturdy, though). On the other hand, Linksys spanks about everyone when it comes to support on their consumer-grade units. Fortunately, the D-Links are bulletproof enough they don't need support very often.