Had a SF SFL-1 years ago so I know that pre. The SF Line 1 is a step up over the SFL-1 so that would be an improvement as well and is a remote control unit. I've owned a ModWright SWL 9.0 SE and that's another more punchier, great preamp in that price range. Not heard the Herron's but they get great press by reviewers and actual users.
Won't go on and on what's the best for the money but yes, many preamps in your budget will outperform your SFL-1. I would add I listened to several ARC preamps below the Reference units that I felt the little ModWright outperformed; not saying the ARC's aren't nice preamps but I think for the money or less they're better options. The Reference preamps are another story and a lot more money but hold their own against similar priced and costlier competitors.
ModWright is bringing the SWL 9.0 SE back as an Anniversary model that might be something to call Dan on to see when it will be out. I believe that will be around $2K new.
Won't go on and on what's the best for the money but yes, many preamps in your budget will outperform your SFL-1. I would add I listened to several ARC preamps below the Reference units that I felt the little ModWright outperformed; not saying the ARC's aren't nice preamps but I think for the money or less they're better options. The Reference preamps are another story and a lot more money but hold their own against similar priced and costlier competitors.
ModWright is bringing the SWL 9.0 SE back as an Anniversary model that might be something to call Dan on to see when it will be out. I believe that will be around $2K new.