There are a lot of good print labs that can be accessed online. Hopefully, you've got a calibrated display, all your color management and printing ducks in a row - Tutorials on Color Management & Printing.
Which lab I used depended on the product the client wanted. Consquently I used 6 or 7 different labs.
I actually just got some 11x14 done by adorama and they came out quite nice, though as of today my uncles has opened the doors for me to use his lab to do any prints I would need (been a few years since ive been in contact with him, hes a local photographer and does everything himself on site for the past 35 years)