I've owned two sailplanes - a Blanik L33 solo and a Schweizer 1-35C. I currently own the 1-35. Really liked the Blanik, love the Schweizer. Good performance, about 36:1, great climb, all metal and I can leave it out. Average price here in the states is $15-18K USD, though I got mine for a bunch less. I don't know if there are any on your side of the pond or not. One of my 6'4" buddies used to fly it too. I am 5'8" on a good day. We were both very comfortable in it.
You are likely to get as many opinions as you get replies. There are many good choices on what to buy.
-- IFMU
PS a good stateside classifieds is on the wings & wheels site:
wantads1
There is a nice 1-34 for $11K, a good choice too.