I feel like doing something to my bike. It's a 2013 Roubaix Expert. It started life full Ultegra but now it's got an XTR RD with an 11-34 cage. The setup has worked well for me and helped me climb hills and stuff.

For about the same price I could probably do one of these two things:

1. Go Ultegra 6800, with a long cage RD and an 11-32 cassette. So new brakes, brifters, cranks, FD, RD, cassette, etc. I like this idea because a) everyone I know with electronic shifting loves it and b) being able to shift under load would be great.

2. Quarq Elsa R + Praxis Works rings. I was thinking about giving training with power a try. Not sure how good that would work without having a dedicated coach (vs just a TrainingPeaks subscription).

If I hit the lotto I guest I could do both...but if you had to choose one over the other which would you choose?

Edit: The downside, of course, to the Di2 option is that I'd lose 2 teeth, going from 11-34 to 11-32. Forgot to mention that.