Sounds about right for price provided it's super clean and basically like new. Your biggest hit price-wise will be that first few years.
Last year I picked up a like new 2006 model year Craftsman LT2000 w/ 18.5hp briggs, 42" deck, Peerless hydro and twin bin rear bagger for $350. Dude even delivered it to my house. CL purchase, pretty close to the house.
I sold the rear bagger kit a few days later on CL for $50. It was missing one bin and I have no patience for bagging.