a lot of wheel & tire can fit depending on how you set it up. with adjustable suspension and proper tire selection, you can fit significantly more than one might think.
17x8 +38 with a little clearance between the fender and strut means you will be much closer to the strut on the inside and definitely poking on the outside. if you run a stretched "flush" tire, say a 225/40, you roll the fenders flat, and maybe do a slight pull/flare, you will probably be able to fit without rubbing.
best bet is to find a wheel/tire shop that has a 17x9 +45 that you can fit to YOUR setup. having someone test fit it for you might not give you as good of an idea...
but yeah - from what i can tell there aren't a lot of msp's running aggressive wheel and tire fitments, so if a msp guy ends up getting and fitting these - you will definitely be the pioneer...