When I've run with the black prodrives i've just left the sensors out since the tires are almost dead and I don't want to take them out of the OEM wheels yet.
none of the people there with 235 or 245 mm tires were running 7" wheels... 235/245s may fit on the sti wheels, but they will not fit on stock wrx wheels.no no, they fit...
but there was so much play in the sidewall that any gain in surface area was countered by sloppy tires ...lol.
I wish I could find it though. they did look pretty awesome!
but to answer the question, 225/45-17 will fit just fine on a 7" to 7.5" stock rim and will look somewhat beefy.
EDIT: here's the thread I'm talking about: http://forums.nasioc.com/forums/showthread.php?t=791216