Rotel amps.
To be honest, I think the Rotel amps are better than their pres. I love the features on the preamps, but think you will find that pre-amps from other vendors are cleaner-sounding, even attached to Rotel amp.
Of course, if you move to another vendor, you will be spending more money on the pre (unless you go used, which makes it hard to hear in advance). I think an upgrade on the pre will give you a good improvement for the buck, if you can justify it.
Overall, Rotel offers good value for the money, I am sure you will be happy whichever way you go. Try to listen in advance.
To be honest, I think the Rotel amps are better than their pres. I love the features on the preamps, but think you will find that pre-amps from other vendors are cleaner-sounding, even attached to Rotel amp.
Of course, if you move to another vendor, you will be spending more money on the pre (unless you go used, which makes it hard to hear in advance). I think an upgrade on the pre will give you a good improvement for the buck, if you can justify it.
Overall, Rotel offers good value for the money, I am sure you will be happy whichever way you go. Try to listen in advance.