Dunno about the springs, though eibach are a very pupular choiuce, and at only £150 excellent value for money!
Mudflaps are personal preference, but they do come in handy for keeping stone chips and the like off the rear panels.I`ve got a set of red ones on my Silver 6, a few of my m8`s think they look tacky, the others think they look cool and match the calipers so not at all out of place.
Andy I've got Eibachs and Ralliart Red mudflaps on my white VI. The Eibachs are worth every penny as it stops a lot of body movement and roll. As for the mud flaps, I don't think I would have bought them but as they are on there, they've grown on me and I now quite like them. I certainly wouldn't take them off as they do prevent a lot of chips from stones etc.