My wife and I used to live in Sarratt, which is not far from Rickmansworth. We thought it was a nice town with a nice high street (meaning there was a variety of shops along the street). The surrounding area was pretty, with a lot of hilly walks in the countryside, and there's a big recreation area in town with a small lake.
Getting into London would be a piece of cake on the Metropolitan line. It was about £10 from Chorleywood to Farringdon, but there are monthly and yearly passes available (we both work freelance, so we didn't go in every day). There are fast Met line trains that skip most of the stops between Finchley Road and Moor Park, which makes the journey home a little quicker.
In short, I'd say it's worth a look. Hope that helps.