I would basically second everything said.
If you’re just starting out car-camping in temperate weather; weight and extreme service capabilities aren’t really important. Start with cheaper versions (i.e. heavier and higher temp. bags and tents) and find what works for you. If it doesn’t turn out to be a good experience, you don’t have a huge investment in equipment. If you (and the wife) like camping upgrade individual items as you need to. Also kids grow (we have several sizes of stuff).

Consider these items:

Kelty Triptease Lightline(tm)- it makes guy lines easier to see, hopefully harder to trip over (if you use a flashlight)
http://www.campmor.com/webapp/wcs/stores...6&langId=-1


Insul Mat Max-Thermo-Lite 1.0 Sleeping Pad - Regular - '06 – The side beams make this feel wider than it is ((harder to roll off of)
http://www.rei.com/online/store/ProductD...0000008001&