Ben, you want stretch but you also want to give the car some stick yeah
165's will give you a nice stretch but then you've got a narrow footprint which IMHO, would'nt be the best for ragging round the corners.
175/50's look like balloons
I run 185/45 nankang ns2's on my turbo's as they are an happy medium between the 165's and regular 195.
Unfortunately, i've only seen nankang and kumho make 185/45's but cant find a supplier with the kumho's
The nankangs are'nt as bad as made out to be honest mate, you've seen me drive lol
. Go steady in the wet though
Take a look at my turbo's mate as mine are 7's and 7.5's at the mo so you'll see if you want more stretch or not
. The 7's look square though