Any question answered...

I haven't used a cadence sensor for years now. It can be useful (moreso for new riders) but it's not necessary.

You don't need to worry about your heart rate either though it can help to know it if you are training for specific races or events and want something for pacing and measuring training efforts.

Wanna buy my Polar S725X? :)

Thanks, I ordered a 605 yesterday morning though :)

It's going to my folks house as a Christmas present so I suppose I should tell them now.

I was discussing this with cupcakes yesterday - I think my Garmin requirements are slightly different to a lot of people on here, I want one to help me find my way to places like this, I want to know how far I've gone and preferably how long it took but that really is plenty.