What is the best premp for Atma-Sphere MA-1 3.3 amp?


I am thinking about Atma-Sphere MA-1 amp to drive Sound Lab speakers. I can go with A-S preamps (MP-1 or 3) but I was wondering if there are better sounding or better value preamps that match well with MA-1 amp. I am new to tubes and am concerned about the tube hassle, but it seems that the improvement in 3D and clarity of tubes may be worth it. Any recommendations? I wan to stay slightly below the proverbial "point of diminishing returns."
128x128chungjh
Post removed 
Another vote for MP-1. I have MK 3.1 version and absolutely love it! Previously I was using MK 1.2 which already was fantastic. This almost latest version is even better. The match with M-60 is perfect. 
 @select-hifi    

A number of people indicated that A-S MA-1 goes well with 545s. Compared to Nords or other SS amps, you don't find MA-1s lacks the dynamic/punch sound of SS?


Just to quickly chime in and please note I am a dealer for A-S. Yes the MP-1 is clearly better than the MP-3 but it's also substantially more $$$ not that $$$ has anything to do with SQ but in this case it does. The 3.3 vs 3.1 or 3.2 is also better in the MP-3. Personally I did prefer the MP-1 3.2 line section vs the MP-1 3.3 line section but the phono section in the MP-1 3.3 is again clearly better/quieter. These are my own subjective views. 
I can also say I bought SL 545's and as much as I really wanted to like them (I LOVE their bigger speakers) I just could not get them to sing. Roger West did take them back after almost 4 months but still it was a $$$ learning experience. 

(Dealer disclaimer)
sksos

Is it possible that your room was too big for SL 545?  What is your room size?

What did you use do drive SL 545? A-S MA-1?