I don't know too much about C & J -- fine shoes I'm sure -- but I'm a Church's man, and I would strongly advise first trying on the pair you're contemplating. There is something especially tricky about a monk strap. Careful of the largish, SF-approved models, with elegant, long tapered lasts that end up looking like m'f'ing gunboats on your person. I like the Westbury and the Beckett models from Church's. The new 173 last is an improvement on the earlier, somewhat clunky 100 last. Monks do look good with jeans, are still pretty rare in the US, and really only start looking great when thoroughly broken in. I aver, choose based on the all-important and subtle last shape in your Northampton shoes, regardless of brand.