I'd definately go for the +35. Fitment should be fine, worst case a little rolling of the guards, all depending on how low you are of course. I have +25 on my 15x8 in the rear and 15x7 front and its fairly flush with the guards.
The only issue i see is that you will need a spacer in the rear. Well not need... but if you are running same size and width front and rear with the same offset, then the front wheels will stick out more than the back, which looks a bit crap. Generally for our cars, it seems 7 inch front 8 inch rear with same offset front and back will result in a relatively eaven fitment between front and back.