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Don't mix RFT and non-RFT - the difference in handling and sidewall flex etc is too great
I have now tried many different normal tyres and runflat versions, across different cars. By far the most consistent, comfortable and secure (and most expensive unfortunately) is the Michelin Pilot Sport 2. Closely behind is the Continental Conti Sport Contact 3 which has better wet weather handling characteristics in terms of a more neutral breakaway, but less outright grip and cornering ability in the dry.
The Goodyear Eagle F1 is very good also, but the wear rate is a little higher and the noise/comfort levels not as good.
Pirelli PZero Neros and Rossos follow in that order - what you'll find with the Neros in particular is that whilst grip levels are high in the dry, there is a slight graininess and knobbliness to the ride quality, which transmits itself as a minute vibration through the steering wheel and base of the seat. Not uncomfortable by any means, but noticeable all the same.
If you want to retain the runflat system, then certainly the Michelin Pilot Sport ZP tyre (for zero pressure) is light years ahead of the Bridgestone and is now considered the market-leader in outright performance. And it's really almost as good as the non-RFT version. Expensive though!
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