BAT VK-20 vs BAT VK-40 vs ML 380S


I've heard a 380S and love it, but unfortunately can't afford it. The BAT models are more in my price range, but I don't have a dealer nearby. Can someone compare/contrast the 20 against the 40, and then against the 380S? Also, is the six pack BAT upgrade worthwhile? Thanks!
dinguses
I know that the vk-40 is a big step up from the 380. I owned a 380 and then went to the 40se and it was a significant improvement. hope this helps
I am also considering these brands of preamp. Lordgorian, would you mind getting more specific? Thanks, Z.
I would like some clarification as well, Lordgorian. Are you talking about the 380 or the 380S? Also, I'm not familiar with a VK-40SE...I thought the SE models were tube models whereas the 40 is solid state? Can you say how it's better? Thanks!