I think you're way high on the discs, no idea on the decks. I bought two sets of discs, one at a tractor stuff salvage yard, paid $35 for those. The second set came in a package via ebay, there was a 10" plow, cultivator, disc and spike harrow and only sold for $13 and change for everything.
I agree with Kansas that the starting bit MIGHT be a bit too high.
Here in PA, the mowing and garden seasons are done for the year. You might have more interest in the spring if you can wait. In NC... I don't know how the garden & mowing seasons are.
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