I recommend HOSTEUROPE in Cologne.
When I was working for fotocommunity.de 10 Years ago they were already running subscriber sites with more than 1 Million members.
I have never experienced any glitches since 2004 and the 24/7 support runs in English and German. You nearly never need the support, but when you need it you get someone on the phone who knows the answer, not a call center.
A friend of mine is a professional web developer for huge sites like zentis.de running TV commercials for their landing pages. Also he relies on HOSTEUROPE for running all of his customer sites.
I do not personally know anyone who ever had trouble with HOSTEUROPE, although I have recommended them on several occasions.
They are far from being the cheapest in Germany, but they are very near to being the best in the world.
I have no economical connection to them except for being a normal customer there since 2004.
Should you evaluate & decide for them I can reclaim an award that I am happy to give back to NG in full.
My interest in writing this is only, that I want our site to run flawlessly. Now & forever.
Frank