Another fan of Qwik Park. I've even been parking there for business travel lately because the McNamara deck is full so often - and it really sucks to drive down there and find that out and then have to go find other parking... and the airport shuttles from the other lots don't run very frequently and drive around to three different lots. Even if you don't have the coupons for Qwik Park, the AAA discount is good. Their shuttles run constantly - sometimes there are two or three at a time in the pick-up area.
All of the off-airport lots have gotten more expensive because of the surcharge they have to pay every time one of their vans enters the airport pickup/dropoff area.