MM4x4 were the cheapest, cost about £240 all in, and had them the next day
medium kit does the job for me, i do tow a lot, and carry lots of kit around in the week,
plus i have a roof rack, winch etc, i mainly got the kit because of the winch, old standard springs didnt like it too much but having fitted them it has improved my discos road manners 100% got a terrafirma steering damper too
Ian