Unless you're climbing HC mountains, if you're using a 34 cassette, getting stronger at this stage of the game for you just means riding more. If you're hellbent on buying SOMETHING, just get the electronic gruppo. A PM and coach at this stage of your game is likely to just discourage you and to make cycling less enjoyable in the sense that "training" winds up turning cycling into a chore rather than something you do for enjoyment. I should also tell you that I have the Quarq + praxis rings on all of my bikes and "training" and a coach became a chore for me. Also, I don't have any plans for going to electronic in the foreseeable future.