I really like the Golden Grey, or Golden Grey Master: http://www.zooplus.co.uk/shop/cats/c...ies/cat_litter
A little bit goes a long way. Jamie seems to prefer it, and when fwan's cats were here last year, they insisted on using that, rather than the Catsan she brought along for them. We got a free sample of the "Clean", and that was quite good, too.
Cat Exclusive is better for medium to long-haired cats, as it's not a "fine" litter, and thus doesn't cling to their fur as much. Extreme Classic is very fine and clumps well, but is extremely dusty.