I used to have a rack setup(did the shred thing for a while), and, while the sound I got out of it was good, I felt like it was a little less responsive to my playing than a regular amp. So, I ended up selling the rack piece by piece, till I ended up with just a single preamp and poweramp. It sounded better, but I just felt like I didn't need the extra little bit of control and variety it gave me. So, to make a long story short, I kept the rack, but began searching for the best stack I could find, eventually settling on an original 5150 head, a Marshall JCM900 4x12 cab with Vintage 30's, and a Mesa 4x12 with stock speakers. This setup is for live playing(in some venues, I only bring one cab, which is decided upon which one I am in the mood to play), but I use it, among other combinations in the studio. I'm getting the best sound and feel I've ever had.