Q: The rim I want has a different offset than stock. How far from stock can I be? Why does it matter?
The stock offset is 53mm or 55mm mattering on year. This means your rim is mounted to the hub about two inches further out than center. The suspension expects the center of the rim to be there accordingly. Changing the offset more than a few mm is unwise. You can seriously hinder the stock suspension's capabilities. Try to stay within 5 mm of stock so, basically, no less than 48 mm. Is 47 so bad? No, but <40 sure is. It's a gradual thing. 5mm is just a rule of thumb. Balance the decrease in performance due to offset issues against what you'll be gaining in tire though.
So, basically the wheels you picked have too small of a offset and are not going to work that great. If you need further information...I'm sure mosc or someone else will be able to step up and take it from there. Reading the link at the start of my reply helps too.
There's nothing wrong with +45. Once you start getting close to +40 and less, then I wouldn't bother. People will just talk about wheel bearings, but that's the least of your inconveniences.
+45's not going to hurt anything but the offset is not "good". You can find plenty of higher offset wheels for <$550 a set but if you really like the look of those wheels, I say go for it.
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