225/50 seems a strange choice, very tall.
If you're looking to preserve the same ratio as stock:
205/45R16 + 235/40R17 (about 1/2 inch shorter)
215/45R16 + 245/40R17 (marginally shorter)
If you do want a 225 up front, go with a 225/45r16 which will only be .3" taller, as opposed to the 225/50r16 which is 1.2" taller, and will likely rub. If you have tires that can handle 225/45r16 up front, get a 255/40r17 rear to match it.
What some people are doing is going to a smaller rim size and getting:
225/45/15 front and 245/45/16 which seems closer to what you wanted.
I don't think the S.Drive are all that popular! A fine rain tire, but you sacrifice much performance. (See http://www.lotustalk.com/forums/f91/another-need-help-deciding-tire-should-i-get-thread-poll-71228/