Alan, in that case it does sound like you would be a good candidate for discs, just because of all the constant grit. As others said, if the idea appeals, then you have to start to look at all the various angles of if your frame can take them, new hubs etc etc, but perhaps a diff bike with discs would be a good idea for you in the future at some point. I could seriously see the appeal if you are doing that much rain riding.