Grasshopper 725D T6

Its my 4th year mowing i do about 30-40 hrs of mowing a week and plan on picking up more accounts. i have a 95 woods front deck looks exactly like a grasshopper but performs nothing like a grasshopper, constant problems even with a new engine. i have the chance to buy a 2009 grasshopper 725DT6 for less then $4,000. it has a little less then 1800 hrs and i am worried that if i buy it the first thing to happen is the hydros going out.

Basically I didn't know if i should be worried, just take the deal, or just let it go.

and also what is the difference between 725D and the 725DT6