b. it is more flexible, since you can also use it as a bridge (which you need if you want to use a laptop in your car once in a while (wired to the "car network" which is connected through the WAP11 in the house).

The WET11 is actually a bridge, and can be used in the same manner. Of course, you would need a hub/switch to have the empeg and the laptop plugged in at the same time.

I completely agree with you on going with a WAP11 instead, though.