Let's say I buy a brand new 2008 Walker MT-GHS with the 26efi. and a 48" deck. No other bells and whistles or options. After two seasons/years of light residential use I end up having approx. 200-300 hrs. on the unit and it's in immaculate shape with all maintenance performed as scheduled. What would you think it would bring if I were to sell??? On a side note...are the cast iron gear boxes (option) worth the money on a 48 GHS deck??? Why??? What is the additional cost???