just realised you're on 17" wheels. A good compromise between the PS4 and RS5 is Falkens FK510. They are bloody brilliant. Just fitted them to my F30 330d and also had them on my Mondeo ST.
I've mentioned it before in other threads they are very similar to PS4's in performance, they even have very similar tread pattern.
For 215 45 17 they're just £64 from Demon Tweeks. Cheapest PS4 i could find was £96. That's near 50% more expensive.
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Will the Falken Azenis FK510 suit your car? Find the best tyre for your car read 136 reviews for the Falken Azenis FK510 and compare to other Ultra High Performance tyres at tyre reviews
PS4 below for comparison.
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Michelin Pilot Sport 4 Image