Having asked in my local garage, I researched on here and decided to go with the RP4s.
Managed 9030 miles on the original Bridgestone ones, and didn't have any trouble or complaints. The RP4s sounded good and only £40 more total, so, I went for them.
Bedded them in with a 45 mile scenic trip, inc. a short bit of off-road. I was gentle on the road cos they're new, but they feel fine. Will start chucking the bike around a bit more tomorrow.
Be interesting to see how they last. 9k on the OEM ones is pretty good.