Tyre snob here too, and take the view that they're your only point of contact with the road, so never scrimp...
Currently running Michelin Pilot Sport 4 (just refitted my summer wheels yesterday), have Michelin Cross Climates on the winters, and Pilot Sport 3 on our Firesta, and all are fantastic.
I fitted Goodyear Eagle F1 on my previous E91 after ditching the awful, and frankly dangerous Bridgestone run flats, and they were superb, but when they wore out, tried Michelin run flats, which felt like they were really working in harmony with the car.
They've been mentioned previously, but not sure about Uniroyal Rainsport 3; a mate put them on his E46 and was really disappointed with how squishy they were, and how quickly they wore out, compared to Rainsport 2 (which I also had fitted to the Fiesta and an old A4, and were brilliant).
A few years ago another mate just bought a car which had two brand new cheap Chines tyres on the front, and asked me to try it, as he thought it was just him having a problem, but I managed to make the front end slide on a dry roundabout at an appropriate safe speed - needless to say, it confirmed his fears and they were replaced straight away!
Always a lively debate, but my view is that you get what you pay for, and a heavy rear wheel drive lump like the E60 needs something sticky to keep it in check...