If u dont go to lancelin then u deserve a kick in the nuts. Lano as we affectionaly call it goes off with 1.5m of swell, but the flatwater inside the reef would suit ur wife perfectly. Somone would know the number for the real estate agent, but there are some wiked little houses up there. At lancelin you may not need to get a car at all.
forget avalon ..... the ppl who sail there talk it up way too much and are still stuck in the 80's (just for u Pinna

). It also need like 3m of swell to get waist high waves....forget it.
margret river wouldnt cater for u and ur wife sailing at the same time so piss it off.
Just my take of the spots i have sailed and spent time at.
Regards Bertie