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I've heard non-stock sizes on rear can burn out your diff depending. Guys here can comment further as I am no expert.
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The only thing that would bother 2wd is different diameters on the rear axle. 4wd setups will work over the center diff if fronts and rears have differing diameters. All the diffs are doing a little work most of the time, I'm not sure how much % error in sizes it would take to start to heat them up.
Running non-standard diameters (225/45 on front) will affect the suspension geometry, the radius of a wheel is part of the overall design. In this case it probably isn't such a radical change that you will have any trouble with it. I'm running 205/55-16 and 245/45-16 on my SC and it helped eliminate a tendency to oversteer under power; each car is different, YMMV.
I am running S-03s, AVS Sports, Ecsta 711s on different beasties, the 711s are pretty darn good for $44 ea, the S-03s seem to always develop flat spots when parked for a few days but have good grip that gives up nice and gradual, the Sports have a steel sidewall ring and are very snappy.