You've got at todays prices $1146.00 for the basic RS rake and $934.00 in options, the castor wheels and the scarifier. If you haven't already, go to
York Landscape Rakes for Tractors and ATVs, Rotary Brooms, Stone & Rock Rakes, Sweepers, and Scarifiers Manufactured by York Modern Corporation and look up the RS model. It's one of the lighter rakes built for 10/20 hp tractors so you're right in there. What it doesn't have is the standard factory built angle platform (like my RI model) for a hydraulic cylinder, but it will manually adjust to five preset angles. I saved more than half of what York wants for their hydraulic cylinder kit by buying the parts from TSC. The two cranking rods I think are aftermarket modifications probably to work a road crown and if so, all the better.
If you have a set of remotes, take a close look at the rake to see if it would be possible to fab up a hydraulic angle platform, I sure like mine and use it a lot-much easier than hopping on and off of the tractor while making winrows, ditching and road crowning.
Personally, I would pass it over due to the lack of the hydraulic option but I do think you have some dickering room here.