I've had a few combinations with my 3A Sigs. and find my current set-up very satisfying. The preamp is a Sonic Frontiers Line 2 Special Edition and the amp is the Bel Canto 200.2. I've had much larger amps and was worried that the BC, with 125 watts per side, wasn't going to give me the bass drive that I had before. However, my worries were unfounded as the BC handles bass on the Sigs very nicely. A plus for the BC is that it is small and does not generate any heat. Also, the BCs convert to mono amps very successfully, if you want to add a second one at some point.
The SF tube pre, while being very neutral, gives that little bit of magic that I don't find in an all solid state system. Good luck on your search. If you can find these pieces used, they should come in around your $3k target (maybe a little over).
The SF tube pre, while being very neutral, gives that little bit of magic that I don't find in an all solid state system. Good luck on your search. If you can find these pieces used, they should come in around your $3k target (maybe a little over).