First, audition as many speakers as you can in and near you and Milwaukee. Make appointments with dealers and spend a whole day (or two) listening down here in Chicago......first component I would buy are speakers.
You have already started with the room acoustics by contacting GIK
Defiinitely upgrade your power, it will work no matter what components you choose. At least 1 and better yet 2 dedicated 20AMP circuiits with audtiophile power outlets. Very nice power cables.....upgrading my power was an eye opener, and better performance from some other choices