You still need to be more specific im afraid mate.

There are a wide range of these turbos, each for different power levels and with their own characteristics.

The GT28RS from garrett is a popular choice in the 350bhp or so region and can be bought through traders on here such as martin-reyland, moving up the power range a little, the GT30 is very popular with the 500bhp or so brigade and again you could do far worse than to talk to martin.