There is no "SF2" people get lazy and leave out the AutoTrac. At least you'd better hope so, might be good to verify. Prices are all over the board lately on these though, mostly down of course from a few years ago. 

AT and SC are pretty common, surface water pro is rarer and rowsense in the middle. Maybe these double the price? $2500 plain display with these it's $5k? No idea just spit balling. They were worth way more when new of course