The Focus Cayo have been getting really good review and won cycling mag bike of the year. A couple of friends have got Focus bikes though not the Cayo, and they have been really please with them.
If you are after a tri specific bike Focus also do the Izalo Tria for £900 which has also got good reviews in the months 220.
I have been looking around for a new bike for about a year now and have finally chosen the Cayo Pro at £1600 just have to save up the extra pennies now. Hope this helps