I am looking to buy a 1999 Walker 25 HP, 48" MTGHS. It has 1380 hours and seems to be well maintained. This will be my first commercial mower, and I will be primarily using it for 1/2 - 3/4 ac yards, and only cutting 3-5 times a month with it. Any ideas on what this is worth? Anything I should look out for or ask about as far as maint? Thanks for the help.