I agree about the geos. Also, I would say Premier.pro is one to keep for 2 reasons.
Firstly, Premier is a very common component of company names. If you look on CompaniesHouse.co.uk, for example, there are hundreds and hundreds of UK companies with Premier in their name. All you need is for one to be called Premier Group, Premier Limited, Premier Corporation or Premier something non-descript where the second word could be dropped from the domain name and Premier.pro could be a very desirable domain name.
Secondly, Premier and Pro are superlatives, they mix well as an online brand. I caught First.pro for very similar reasons. First.pro or Premier.pro would be brilliant standalone brands for an online consultancy, recruitment company, training firm etc. Brandables were ten a penny a couple of years ago, they are still harder to sell but I think my sale of Switch.pro to a Japanese lighting engineer shows underlines their potential value.
I chose my favourite hand regged .pro brandable, Total.pro, to be my .pro website name because it sums up what you can do with .pro. Total is a short popular company name, Total.pro can be read as Total Professional which makes semantic sense, Total and Pro are superlatives summing up excellence so they reinforce eachother, on the first page of the website I have a graph tracking total .pros registered, and the site is totally about .pro. I refer to this sort of thing as layering. The more layers or angles a domain has the better. The Japanese lighting contractor who bought Switch.pro liked the switching to new lighting and switching a light on angles, this is another example of layering.
Another .pro I quite like is Challenge.pro because Challenge is a professional context keyword, people talk about a job being professionally challenging or a professional challenge. Challenge.us sold for $1,595, I think a site associated with a professional challenge (eg VSO type work, changing career, mentoring etc) is more valuable commercially than a site that says "Challenge Us" which is presumably why Challenge sold in .us.