The T3 is a great keyboard you could have; but not sure of the price range. May be the Roland Bk-7m would suffice, if you`re looking out for playing out of the box without too much tweaking. It is an arranger module. It has about 433 styles in the ROM + Roland Europe had another additional 578 styles from their style library(I guess from the older Rolands).so thats quite a lot. Additionally it wont take up much space since its a module. Ofcourse it`ll need another keyboard(MIDI compatible) to control it. You may want to ask the music store experts if you could use an arranger keyboard say the PSR S910 midi-ed to the Roland Bk-7m. You`ll have best of both worlds
And oh my .... when the Korg Micro arranger comes out, you may use that as your Korg arranger module So a used S910 + Bk-7m + Korg microarranger in under £1900 ? .. could be possible. I am not from the UK so I would not know the pricing. In the above scheme, you`ll have most of the sounds of the big three covered, never short on styles . Morever, as Tony suggested, the Audya with some awesome sounds and styles(including some real audio not midi drums) is very good as well. Meanwhile, a large community is awaiting the S910 replacement which is expected sometime next year. Whatever you plan to buy.. try it out first. Good Luck in your search.