Here's my $0.02.
Earlier this week I replaced the stock IRC's with Bridgestone BT45 Battleax tires. I should have done this sooner.
While the IRC's were great for longevity (20,000KM), they just never give me much confidence when cornering but I always thought this was me just being cautious and not deciding to push things.
I was wrong and the Bridgestone's give me tonnes of confidence and I'm leaning the bike like never before. The difference is like night-and-day. Before I was just grabbing the the road - now I seem to stick to it.
I kept the stock sizes and have put on about 800KM since they were installed. Most of the roads are twisty back roads with maximum 80KM/H limits with some highway thrown in.
While I have not tested them in the rain (yet), they've handled damp pavement exceptionally well and I expect them to be just as good when the clouds open.
I fully recommend Bridgestone's Battleax BT-45 to anyone looking for a great tire for all-round conditions.