newbie help - 17's on an 1302

[flat4fanatic]

Hi,
can i pick your collective brains?.
Trying to decide on some wheels for our 1302 project.
I have some slim struts for the front.

Looking at 7x17 et 38 or 7.5 x 17 et 35 or 7x17 et 42
Would I be able to get away with standard wings with any of these?
Would the ones with the bigger et give a really bad turning circle?
Finally is there an et limit for caliper clearance (stock bug 4 bolt discs) or does it depend on the wheel design?

thanks,
Steve