The issue isn't money, the issue is is it worth putting the money into this house or move to another house? I don't think I'd see the pay off finacially here. Here are some things we've explored recently:
Rip the roof off the garage, and knock the back wall out of the garage. build a master suite on top of the garage, and push the garage back another 30' and build a larger shop section back there where i can drive through and have lift access.
modify the roof trusses over the right bay so I can gain ceiling height
knock the back wall out of the garage and build a larger shop area like in option 1.
build a 30x50 shop in the back yard with 3 additional bays and move all my tools back there and keep the attached garage for Krista and I to park in.
move to a new house
Right now I'm leaning towards option 3. We're getting ready to do a kitchen remodel, which isn't going to be cheap and I could build a garage for the cost of the damn thing and we're building a new deck with an enclosed screened porch. So I'm no jonesin to spend another 50k on a shop behind the house or a garage remodel.. We looked long and hard at moving and we've committed to staying in this house for another 5-10 years. We like it here, we like our neighbors, and our street is perfect for our kids, so I just want to make do for awhile. What I really want is option 4, but as previously mentioned, I don't want to spend the money.