I can get a roller bearing T28 for £910+ postage, or something like the T25 with .49 rear will do, like i have now

, this is £520 new or i'm thinking of selling mine soon to upgrade to a T28 as i use mine for drag racing, keep an eye on the for sale section.
Here is a price list, you would have to add postage to any of these prices.
T25 with .47 rear, good for 180bhp, maybe more depending on engine spec £450 (this turbo is closer to the KTR 230 than the 180 as the 180 runs a bored out .35 T2 rear housing ) 55 trim comp wheel
T25 with .49 rear 225 bhp £520 60 trim comp wheel
T28 with .49 rear 260bhp £620 50 or 60 trim comp wheel
T28 rollerbearing 280bhp £910