I can't believe nobody has mentioned Richard Photo Lab, that's who I go through.

They take forever and are outrageously expensive, as in I'm spending about $100 for 4 rolls D&S that I won't see till December, but I get perfect results every time off their Frontier.

They cater to the individual, so if you make common adjustments they'll remember that, and as far as a portfolio goes, they're as impressive as they get.

http://richardphotolab.com/