If it were me....
I'd look at it like this, you have 10-20k to spend on awesome things... You by your own admission don't know a lot about high end hifi. Most people have a point at which spending more on an object doesn't increase the enjoyment you get out of it. For example I can hardly see a £200 chopping board making me happier than a £10 one.
For speakers I would try to find this rough price point. The way I would do it would be to take a few companies eg monitor audio and listen through the bronze, silver, gold and platinum lines (with suitable amplifiers) until you find a price point where spending more doesn't really improve your enjoyment of listening to the music significantly. You could do this with b&w, wharfedale, adam etc etc.
Just don't pay £20k when the £8k chopping board makes you just as happy. :bounce:
PS I'd also buy one of these:
http://funkywaves.net/catalog.cfm?item=fw_18_0