Think I want a touring bike?

Are you serious? A good pair of hydraulics (Shimano Deore above) will work for years without any service, no problems just fantastic modulation and power. Don't need anything harder to get than a multi-tool and some sewing machine oil to re-bleed them and the pads will last for ages. Unless you are riding in an oven you will not be having any problems with heat, might be time you tried disk brakes again they are wicked.

hydraulic disk brakes can boil on long descents which causes them to fade, mountain bikers can get this often in the alps if they are using small disks and braking alot. Don't think this would really be a problem on a touring bike though unless your going down some massive mountains and braking all the way down.