I agree with the above posters. Room evaluation, if I had a dedicated room would be my first move. It seems like you have a space and depending on the WAF it seems like you can do some acoustic treatments.
If your happy with the Usher's then combining room treatment and the speakers you plan on keeping awhile is useful.
Since your interested in ARC gear and the Rotel's seem to drive the Usher's fine to your ears, you might want to check out a pre amp, after the above is taken care of. There are rave reviews of their new LS-26 here on the 'Gon. I have not heard it but it was on my short list.
Enjoy and let us know how you progress.
If your happy with the Usher's then combining room treatment and the speakers you plan on keeping awhile is useful.
Since your interested in ARC gear and the Rotel's seem to drive the Usher's fine to your ears, you might want to check out a pre amp, after the above is taken care of. There are rave reviews of their new LS-26 here on the 'Gon. I have not heard it but it was on my short list.
Enjoy and let us know how you progress.