Be sure your speakers are set up the best they can be before upgrading anything. You might get some of that magic for free. My (3A Sig) mistakes were assuming the tilt back was the same because I used the same shims on each speaker. That was not true and the 3D image suffered. On top of that, moving one speaker forward or back by as little as 1/2 inch solidified or blurred the images. The 3A can be used near the back wall without booming but stay away from a room corner. If you've already got your speakers painstakingly dialed in, good for you, ignore this. As for upgrading your system, changing just one component *may* get you some improvement. If your preamp is a *severe* bottleneck it could be a big improvement. From past experience, with your modest system I think you will be disappointed putting that different a league pre in the mix.