Beware of creeping featuritis. Cateye Strada with cadence is a great way to go.

If you decide you want to log climbing, look into some of the GPS with barometric altimeter and a cadence sensor. Might want to add in a heart rate strap, which the GPS will also collect. Make sure it has mapping in case you miss a turn (east Tennessee has enough back roads this is possible!). And a power meter will help you plan, execute, and log your training.

See what I meant about featuritis?