Personally i find the yellow britpart bushes pretty good.
I have used flow flex bushes when i have been doing work on MG's they were crap for the MG's especially the roll bar bushes.
I have heard loads of good things about Super Pro bushes. A lot more expensive than britpart but suppose to be great.
My britpart bushes have been on for 2 years now, The ride is still good, passed MOT a few days ago and i do loads of offroading so for 40 odd quid i cant moan about them. I have loads of Britpart stuff on my Landy personally i havent had probs with there stuff suppose theres still time though