It sounds kind of boring, but I favor the classic last in almost all make ups. I think it works the best for most everything besides loafers and boots. One other thing - if you've never tried on Saint Crispin's before, then I'd suggest getting to somewhere that you can. I wear a 8/8.5 US in Alden, a 7/7.5 UK in Carmina, and a 6.5E UK in Saint Crispin's!
Also, for the New Yorkers, Phillip will be in town on the 25th and 26th to take orders for MTO and Pret Customized. If you've never been fit by him, it's worth a visit. Any questions, you can PM me or shoot us an email at firstname.lastname@example.org