7J is ok for width but ET38 is about as low as you want to go, unless you want mad stance and a horrible drive (I would imagine). Unfortunately honda made the stock ET 50 or 55, so we're restricted to 38+ IMO. I had ET42 wheels which looked great, flush with the arches, and have just got some 38s which are hopefully ok, haven't tried them yet. Wouldn't go lower though.
As for tyres, your choice is perfect. I had 215/45/17 and they were a little too big so got a bit of arch rub at full lock, with 17" wheels.
I have to second the need for spigot rings to bring the bore size down to 64.1. No matter what people say, you need them to get the wheels on exactly right. Even if they're a couple mm out you WILL feel it, and you will feel the difference when you get them to fit perfectly. I've even had pro wheel refurb guys tell me I didn't need them, but I really did. It felt like the wheels weren't balanced. Spigot rings sorted it right out. And they're only a fiver on ebay!
