new wheel for my S4

["R. Wiratorn" <withu@loxinfo.co.th>]

        Hi all,
                Haven't  sent something to the list for a long time due to
hard study.
        The 8*17 ABT wheels on my S4 are out of round again, because of the
        moon-surface-like of the roads in Thailand.
                I'm think I have toreplace all of them. I have two choices
in mind
        1. go on with 17" rims
        2. go on with 225/50 ZR 16, which, I think, stronger than 17".

                For choice one, would you please suggest me any strong 17"
wheels.
                For choice two, Can I use A4's five-spoke 7*16 with 225/50
tire ? or I have
                to use S6's 8*16 ?

                                                                        Than
k you
                                                                        K.Ben