Quality greenhouse kit for extreme weather changes

[utah]

Hey all,

I was looking forward to building an attached greenhouse this summer but my health (and wealth) may not allow. I'm in need of a good, reliable greenhouse to take care of my 150+ babies this winter (yeah, I went a bit overboard).

Problem is, in Utah we can have 4' of snow and temps that don't get above the 30's for months then in the summer we are often battling 100+ degree days (Sunday was 108 degrees as measured on three different thermometers).

I have seen a *ton* of different greenhouse kits but they don't give enough information so I'm turning to my expert friends for recommendations. I will be using electric heat (working on converting to solar) and an evaporative cooler in the summer but I need something that will handle the temperature extremes.

I'm going to have to make due with something about 8x10. Any suggestions of a quality greenhouse kit that won't break the bank but will protect my 'chids??

Help

Thanks all!