The only 16x8 wheels that I know of people fitting without getting crazy (fender rolling/pulling, extreme amounts of negative camber, etc.) are the 16x8 FD RX-7 wheels, which have an offset of like +50 mm. I'm should you could get 16x8 +38 to fit but it's going to require a decent amount of work. What tires are you planning on running with these? I assume you're looking for the super-JDM stretched tire look because you aren't going to be able to fit anything greater than a 215 series tire on those. If that's not what you're going for then stick with the 16x7 as they will require less work and still be lighter in the end. Just FYI, my 17x7's actually weigh less than ther 16x8's you're looking into and you're not going to benefit from the extra 1" width due to tire restrictions.
I'm not trying to bust your balls or anything just giving you everything straight. If you're after the "look" as it appears so many people are nowadays then it doesn't really matter - you'll just have to work for what you want. But if it's performance you're after, you might want to consider another choice.
There are some pics buried in the "What have you done to your P5 today" thread though.
