Ihave the 60-90 size Ultra Stick. Got it off ebay for $100 including postage. Great plane, Ifly mine with a ST.75 and a macs pipe. Nothing really bad to report about the plane except maybe the covering. After some flights if oil gets under the covering, it'll start coming off the plane, mostly on the bottom of the fuse. I've taken some epoxy and run under the covering that was coming up, held down with pins while drying. Anyway, it fixed it. For the money, you can't beat it.
I think Towers Big Sky goes for about $225 or so, you could buy two of these and have some money left over.
Keep your wings level...