I switched from bridgestone 19" runflats on my F31 to Michelin PS2's and they are a lot better. Ride is better (especially over potholes) but also the handling feels a lot more confidence-inspiring.
Managed to sell my part-worn runflats for a reasonable amount on ebay too which helped ease the ££ pain.
Ooo you just wait until you start using a tyre from the last 15 years. You're in for a treat!