An easy fix for the storage problem is to hoist them up against the garage ceiling or to hang them on a wall. If you're really space constrained you can always drop out the wheels and store those separately, that only takes a few seconds. Make sure you tighten the clamps well after putting the wheels in, that will take some trial and error in the beginning.

Another thing, if you're shopping for bikes is to check for new-old-stock, sometimes you can get crazy discounts on bikes that are only one or two years old thanks to the 'fashionista's' who wouldn't be caught dead on a bike that isn't of the latest model year and in the latest colors.