.ES
.AT
.CH
.BE
.SE
.es stands for Spain - huge population. Also many hacks with .es
.at - there were some nice sales in this cctld. Also it is memorable for international use.
.ch - a very established cctld.
.be - good one but there was the free .be promo. Still some people in the reseller market regard it as a free domain. But also strong one.
.se - I did not see that many sales. Even if Sweden has one of the highest internet savvy population, and it is a good cctld, I don't feel it that valuable.
I made my assumption based on reseller values.
All these 5 cctld's are strong ones, and it is hard to make a difference between them.