What the heck? I bought the same system for a new tank at my office last month and this was only USD115.00 + shipping and GST. It was the maximus system with the free psi and tds meter.
oh, sorry, I see you get extra filters.
How's the water in Regina? I know in BC, our tds from tap is about 15-20. The filters will basically last a very long time. I think by the time I get a bad tds reading, I would've lost the spares already!
Unless you're sharing with someone or selling the extras, I'd say just go for the maximus system without the extra supplies.