my thoughts on:
toughness/durability:
I suggest you do not give the claims and counterclaims of relative durability too much weight. I've had this discussion before on these boards, and no one can really say what "toughness" or any other such quality means in truly transferable terms. Typically, people have anecdotes of what one accident did to one computer, but they have no idea how another computer would have done in the same situation. A lot of it, I suspect, has to do with Apple's "bulletproof" marketing theme for the iBook (who wants to test that their iBook is bulletproof? no one on this board has yet taken me up on the request). And a lot of it is, admittedly, perception: people say they treat their _book a certain way because they feel that's how it sould be treated ... ok, fine, it is probably better to treat a laptop carefully, for whatever reason. Rather than trying to sort all of this out, I say just be as careful as possible with any laptop you have, buy a sleeve, and recognize that no laptop likes to be dropped/kicked/mistreated. With nothing more than normal care and feeding, my 4-month-old+ PB travels in a sleeve and looks brand new. When necessary, it wipes clean with a moist (usually paper) towel.
battery:
As for battery life, my 12" rev. c can get a legit 5 hours, maybe more, with airport off, screen relatively low, low usage level, and iTunes playing. Heavy use (by my standards-- AP on, ripping and burning CDs) can still get 3 hours, more or less. Normal usage is somewhere inbetween, probably around 4 hours. These are not lab-quality test results, just my recollections, but that's all most of us here can give you.
wireless:
In my personal experience, I have never had any problems with AP reception, and I have never been anywhere in my home or on campus that my computer did not get reception but someone around me did.