in terms of simplicity and functionality the skyshed pods are hard to beat... however for the price you would have a lot more real estate in a garden shed.. you could easily have a desktop pc with a decent screen, a desk, a set of shelves for accessories, a sturdy concrete pier/pre-fab steel pier in the middle and still have room to move, swing cats, etc etc in a 2.4x3m shed with a roll off roof. at around the 1000 - 1500 mark...
The skyshed (from what I've seen) would be a tight squeeze with a 8" newt, pc, observer + just the necessary accessories... then you'd still be keeping alot of your gear inside the house, where its not easily accessible without bumping your scope on the way out the door...
I'd go with a 2.4x3m shed if I had somewhere to put it
