[punyXpress]

I fitted a Sport Nitron a couple of months ago, & while it did what I wanted at the time, I haven't been able to ' fine-tune ' it so have a bit of improvement to see yet ( I hope )
It cost £361.32 with carriage & VAT, so your end prices will be a bit higher.
As yorkie_chris says, there are others available out there and a lot of the options are vastly cheaper. I personally think your best bet would be to tag along with someone who REALLY knows what they are on about in suspension matters & go with what they say.
Best of luck!