domain: nonst.com related keywords: St. Non (Saint Non) - over 30,000,000 google results Non St (used in the medicine, i don't know what it stands for) - over 30,000,000 google results non stop (maybe) - over 60,000,000 google results what do you think about this one?
IMO it's not a great value unless it could serve as an acronym for a company. I know Web 2.0 has brought a ton of strange names by "nonst" isn't one of them IMO. St. Non would be great if the domain was stnon. Maybe a medical site for Non St, but like you say, who actually knows what in the heck that actually stands for. 5 letter domain is great, but I'm not sure you're looking at a great return on it. But like I've said, that's all just my opinion.
the right expansion is in the medical area, look at the google trends google.com/trends?q=non+st non st stands for non segment. IMO it is more than reg fee. I've seen alot of useless domain names worth atleast $xxx.