If you geta good ST170 then they are not that slow. I have a few of the usual modifications and mine drives lovely. Had mine RR'd at 189bhp so it happily passes heavy ass 200bhp golf GTi's and cupra R's.
Make sure you get one with a decent spec, spoilers xenon headlight, climate control etc were not standard. You will always wish you got one with Xenons if you get one without.