A little about me - I am 33 years old and hence applied only to two US programs. I wanted to apply to Ross but the logistics did not work out and I finally dropped the app. Since I am not from Europe and not really planning to go into entrepreneurship I did not research programs from that angle.
Most European one year programs provide you with an excellent general management education. The programs that I looked at were IMD, INSEAD and Cranfield. I was planning to check into Cambridge and Oxford next but since I got through Cranfield (one of the top programs in UK) I decided to drop SBS and JBS. Also, Cranfield has about 40 years of experience in the MBA education field while SBS and JBS are more recent programs (I believe 10 -12 years).
I also applied to INSEAD for a chance to study in 2 different cultures and see how I might be able to bring in the best ideas to extend my career. INSEAD was also my strecth school.
IMD - They admit only a handful of candidates (90) and I decided against applying as I felt that the numbers worked against me.
All three schools are lenient to older applicants with INSEAD being the school with the lowest average age of 30.
Bottomline - I would suggest that you look into IMD, INSEAD, Cranfield, Cambridge and Oxford in that order. I did not look into the other European programs as they seemed to be more local (eg: HEC is huge in France, IE, IESE in Spain, Bocconi in Italy). FYI -it is my impressions about these programs and it may be totally off base.
I would also post your questions on European programs in the euro board to get more specific replies on the entrepreneurial aspect.