Cutts said he had a personal preference for brandable but it may not be a team position.
engine posted an interesting new case study:
It seems a good domain can actually have the equivalent of higher SERP ranking than another domain simply because it is more descriptive.
The study also suggests users return to sites (domains) they recognize in SERPs. Overall the study pretty much reflects my own approach to reviewing SERPs before clicking. I always look at both the domain name and page title.
I've seen good results for both non-descriptive domains and descriptive domains lately but not for those with hyphens. UK firms always used to love their hyphens but haven't followed google.co.uk results recently.
Thinking long-term you may also want to consider your exit strategy. It may be much easier to sell a business with a good unique brand name.