My recommendation is to stick with the BAT. Upgrade to the VK50SE when you can and avoid the SF Line 3. I did not like it at all in my system. I found it lifeless. The BAT equipment is as good as anything I have heard.
I listened to so many preamps (cost no object) in my system and the BAT was the best overall product. I would also recommend the ARC Ref2 over the SF3 as well.
I listened to so many preamps (cost no object) in my system and the BAT was the best overall product. I would also recommend the ARC Ref2 over the SF3 as well.