Carbonfibreboy - How many people ride 30,000 miles in a year ?

That is 82 miles a day, every day for a year.

I think rabbit and I agree on the Mavic A719 as being an excellent rim but would choose a disc over a drum on the front as you will have much better braking power.

Rear wheels do pick up more crud in bad weather and another part of this is due to the chain and cassette throwing off small amounts of lube which acts as a dirt magnet for your rear rim which will usually be dirtier in nicer weather because of this.

This in itself is a good reason to make sure you are very conservative when you lube your chain and makes sure it is wiped completely clean and kept wiped down.