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You can pull of 20"s if it's lowered with a body kit. 22"s are just too big for the SC. It's better to leave that kind of stuff to bigger sedans and trucks.
18's at the biggest. Its not a impala or a lifted Monte Carlo. I ran 17's on the z for the longest time. Good side wall size, good tire choices, 17's are my choice if buying brand new wheels.
I wouldn't go any larger than 19"s even for a show car. If my car was focused more towards performance, I would go 18"s with meaty tires. If you are trying to fit in with the modern crowd, I'd suggest a nice staggered set of 19"s.