No easy way to price a MH but doing lots of looking will give you a better idea of what is right for you. Keeping your eyes open and ears closed to seller's chatter goes a long way to having a successful buy.
When we were looking we listed things we had to have, space(previous RV too small for extended living, queen bed that doesn't have to be put together each night, shower, heat and A/C, ability to boondock, exhaust fans in lvgrm, kitchen and bathroom, comfortable seats driving or watching tv, no carpet in living area for easy cleanup, I bought ideal, low market price and it was detailed professionally in and out. Don't believe the ads do an inspection,looked at a turn key unit the key was the only thing that turned. When you look at enough units you will be able to move fast on a good deal, if it is good it won't be on the market long. You are right to know what you want and reserve money to do those things needed to make it comfortable. Don't forget to get roadside assistance insurance and a good set of tools.
Since owning 7 yrs, each yr has had a few thousand in repairs or replacement: Tires, dash a/c, motor repairs(leaking gasket between head manifold, std plugs, wires and electrics, wipers, batteries house and start twice, toilet changed to porcelain, tile in bathroom, new shower fixture,kitchen wallpaper replaced with formica backsplash, strengthened, refinished dinette table, new mattress topper, new flat screen tv, rebuilt electrics for exterior steps, replaced both roof a/c cowls(covers), all roof caulking improved and sealed, added shelves in pantry, under sink, replaced drawer slides in bedroom, most interior reading lights switched to leds. Replaced all brakes pads and calipers, Air bags for front coil springs. Switched electric from 30 amp to 50 amp Lots of r and r jobs taking time and little money for example windshield wipers and armature, greasing chassis, improving exterior storage spaces. I am retired and this is also my hobby at least thats how I can justify all the work and money spent