I qualify using just the Lego cache in Berlin but here's my top 5:
6830: GC13Y2Y Lego - einer ist zuviel
1569: GC9A6E Historic Words
1467: GC57DD Berlins Second (but first virtual) Cache
1041: GC4C35 Cuckoo Cache (could be anywhere)
793: GC6F12 London - Beatles Abbey Road
This gives a total of 11700
A good long walk to this one with some great views when I reached the top. Birds singing in the woods at the start, until this was disrupted by a dog walker continually (and unsuccessfully) shouting for his dog Mason.
A land rover passed me just as I reached the GZ so I had to continue on a bit before I could search. When I returned a minute later I spotted it straight away. Wow what a lovely big cache.