We're going to try the mirror thing. Thanks.
I've done the mirror thing for twenty years. It is essential. Be very careful at first until you get used to it. I still look over my shoulder too before doing anything radical, especially for motorcycles. It is possible for a car to sneak up on you if it comes from more than a lane away and slightly behind you. Two complimentary techniques are a proper scan of all three mirrors with peripheral awareness and I am a lot happier if I can stay 2-5mph faster than traffic, makes it easier to mentally sort where all the cars are.
As far as the A posts, who cares, see what you need to see and if you don't spend time driving out of the side window you're not trying hard enough. :D on the can't see the front thing, I recommend a long test drive. I rented a Camry once, great car, something about the forward visuals made me feel as if I would fly off the road when in the left lane, damn near gave me motion sickness.