I decided to cap my budget below my original range, trading a degree of capability on the road for a more financially-comfortable path. I was interested in Giant's models in my price range, but it turns out their stores don't sell size L (58 cm frame) bikes in Japan, and they also don't sell some of the less-expensive models they offer in the US. Didn't find what I was looking for after months of looking at used bikes online either. So I ended up picking up a new Trek Domane ALR 3. Riding it up Mt Fuji the day after tomorrow. Will let you all know how it goes.