hokay... well as for me i own an R56.... unfortunately i havent' seen any Eibachs out there on the market yet... so if you have please show me
but anyway, i have a slight bias toward eibachs because of their combo pack they make with Koni's FSD Shocks... and IMHO those two things together are as good if not better than any coilover kit you can get.
i also stay in contact with Alta Mini Performance group... they have H&R's Coilover on their show car and i know another member (no names mentioned because of confidentiality) is putting that same coilover on his R56 soon... but when it comes down to it... i think that H&R springs would work just fine for now, but if you could i'd wait for the combo of Koni FSD and Eibach springs because i can garantee you that you will not be disappointed with that combo. or just go for koni coilovers
the only way i would suggest otherwise is if you wanted a coilover set from H&R that was their RSS version.... cuz that rivals Koni's Coilovers imo
but yeah... if you're not going to go for coilovers because of money issues or something of the nature... than in all honesty i'd say keep it stock and wait to get new shocks and/or a coilover system because that really does make a difference and will make ur stock shocks much happier as well as suspension. cuz a simple lowering may feel great but can also throw off the entire suspension geometry and you should technically get an adjustable endlink that you can lengthen when u lower the car. once again just a suggestion on my part.... if you've got any questions just throw them at me ^_^ i ususally am here...