If your that desperate on more performance, you may want to consider getting the Zetec, and then getting the Mountune performance upgrade from the UK. This has already been posted on this forum... check out:
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http://www.fordforums.com.au/showthr...light=mountune
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http://www.mountuneperformance.co.uk...=141&Itemid=58
From my short experience with the car (3000kms), the standard suspension setup with the 17inch wheels and a good set of tyres is pretty good. It would be nice if the stability control was switchable, though.
The extra 20hp and 20Nm or so would be fantastic and would probably bring it close to the old XR4's performance anyway. The Mountune upgrade is also approved by Ford UK, so it is likely to be pretty safe and reliable.