Nordic,
I'm not familiar with your Rotel pre, but I had a Rotel RC1070 pre and while cheap, I wasn't hearing enough differences with other pres that would make me want to change, until I got a Lamm LL2. Certainly I can hear that difference, but the Lamm is like 10x the price of the Rotel. Point is don't assume more expensive will always sound better.
I'm not familiar with your Rotel pre, but I had a Rotel RC1070 pre and while cheap, I wasn't hearing enough differences with other pres that would make me want to change, until I got a Lamm LL2. Certainly I can hear that difference, but the Lamm is like 10x the price of the Rotel. Point is don't assume more expensive will always sound better.