Welcome agentcooper :p That's a nice set up you have. I don't have the 990 but I do have it's sister the Sherwood P-965. I upgraded from an Onkyo receiver. First I utilized the Onkyo's pre-outs and used a separate amp like you have which was a terrific improvement as you know. Moving to the Sherwood Pre has made a wonderful difference and I could not be happier. For the first time , I actually feel as though I am in the theater when I watch movies.

Everyone that I have spoken to that has heard both units has confirmed that their sound is very similar. I think you will be just as thrilled with the 990 and you can always take advantage of the home trial period that Outlaw offers.

I have never heard a Rotel though...but many Outlaws here have.