After searching and pricing cabs I built my own. Most anything nice was quite expensive. It cost about $1,200 and has all real safety glass except where it's coped around the hood/hoses/etc. and a 20KBTU heater. It was wonderful when pushing snow last winter.
It also cost me about 150 hours and I still can't believe it took so long, but I'd do it again in a heartbeat. Is it sectional and removable but I left it on this summer. With the doors off and a "school bus driver" fan it wasn't too hot inside.