An update – I said I’d sleep on it.
I had a great training ride last night, including 20x uphill sprints I collected many strava gold medals and top 10’s in local leaderboards.
I’ve decided £400 will buy 4 months of more valuable coaching toward 2018 over the winter, which I believe offsets the 316g saving.
I have set myself the carrot of a strong indicative performance in Race 1 next March leading to the purchase of some DT240’s/Crests as suggested by ADSH as a reward for my winter efforts, also giving me time to save for the extra.