hi mate,
your best bet is to go for a sensible 180 - 190 bhp. my uncle owns 2 rs turbos, 1 has 195 bhp and is very reliable and very sivalised to drive in traffic but also very quick. the other has 283 bhp and needs fixing after every drive, it is awsomely fast but not worth the hassle. if you want over 250 bhp, buy a cossie mate, there more reliable.