i would recommend spax or witec, the springs will stiffen it up good, i have the spax on my mr2, friends mx5, and friends calibra and they have done the job good, my g/fs mk2 gti has the witec ones and there verry stiff
as for fitting its not to hard, if you can get a haynes manual it will tell u pretty much all you need to know in there to do most jobs your self,
my girlfriends ones had a bolt under the top bolt holding the bottom part of the mount to the shock so you can build them off the car then just bolt the top part top mount back on once on the car
if you can get hold or an air gun (ratchet) or an impact driver to remove the top bolt as it will save you having to grip the shaft, if you have to grip the shaft to stop it turning then
MAKE SURE YOU RAP IT WITH A PEICE OF RUBBER STRIP FIRST!!!!!!!! something like what you get with you bike lights or mud guard as the rubber helps grip the shaft, if you dont you swill score the smooth shaft and will write off your shocks

