I know i'm slightly biased but most people who have driven the redlines really do like them as they are really smooth and perfect for offroad. They are really high quality build aswell. I've been running them since they were introduced without a single problem.
You can run the RS with pretty much any motor including sensorless but surley it would be better to go for the full set
.
The Raceplace may have some in stock.. worth a try on 01462 684859, failing that, any shop that has a Muchmore account will be able to get one as they are the UK distributor.