The system in Saskatoon is definitely still valid. It is used actively by Saskatoon Police and Fire. MD Ambulance is on the PPSTN digital system.
If you are wanting a good scanner for the Saskatoon Fire Department, and rural Fire Departments in the surround area using ANALOG frequencies, then I would definitely recommend the BCT-8. As I said, it is older, but it has unparalleled receive capabilities. Also keep in mind, it is a base scanner.
However, if you are looking for something with more updated technology, and something that will take you into the "future", then I would definitely recommend the BCT396XT or the BCD996XT. The 396 is the portable, the 996 the base/mobile version.
Now, when weighing the options of GRE vs. Uniden in SASKATCHEWAN, you need to go with Uniden. Myself, as well as numerous other members in the province, have come to the conclusion that Uniden has fantastic decoding capabilities of the VHF P25 control channels used on the PPSTN. The digital audio is superb. While in the end, a lot does come down to cost, you do want to look for quality. The Uniden scanners have awesome digital quality when used on the systems in this province.
As per usual, if you need further assistance, send me a PM and I would be glad to help you out in any way.