I went to Mike Veal at
http://www.bikedynamics.co.uk in Leamington. He knows his stuff, been doing it fulltime for quite a few years, using video analysis and computrainer spinscan and a number of off-the-bike measurements.
It worked for me, having made countless changes myself without really knowing what I was doing, in a couple of hours he got me a comfortable lower position that just feels more balanced. I haven't felt the need to change anything since, it's almost worth the money just to get it "done" and not feel the urge to change something by half a millimetre after every ride

If you want I can email you a copy of my report so you can see the sort of feedback you get, just let me know.