Epik! Free escrow, 1.5% for domains registered elsewhere, free appraisal (http://appraise.epik.com/) if you have an account, great customer service, marketplace, etc.
UI takes time getting used to but is great for managing lots of domains. Request a "Domainer Discount" through support.
Epik just hired Joseph Peterson:
http://www.domaininvesting.com/epik-hires-joseph-peterson-as-director-of-operations/
A very good move!