I've heard great things about the SD's, and I'm sure you wouldn't go wrong in getting them. My decision was either between those or the BT45's. Turns out that my local shop didn't have either of them and I ended up getting some Shinko 005's installed. I've been very happy with them so far. They took me on a trip down the Blue Ridge Parkway, ending on the Tail of the Dragon without so much as a hiccup. And they were about half the price of SD's
