my spec is a forged 2046cc blacktop zetec, gt3071r turbo, goes some in a mk2 xr2.

best place is probably owen developments or turbo dynamics when i was looking for one, i got a used one in the end for a good price, but budget £1300 for one new.
they run forever after switching engine off, really show how journal ones are more laggy.

FRS paddles are expensive, but work a treat, i had mine at 1.8BAR and held no issue, was surging a little though, so need to map that out.
also, don't do the cosworth paddle, not heard of one working well, even had a go myself and that wasn't great, couldn't handle more than 1.2BAR, the problem is the used FRS covers aren't that good, the uprated ones on the paddle kit are far better, much higher clamping load springs used.