"But I feel pretty confident at this point that either the Decware or the Coincident will be a step up from my Manley gear."
Rebbi I don't mean to rain on your parade but if you CAN'T because of finances, listen first you are gambling. I'm sure there are many aspects of the SET sound you will love but on the other hand there may be compromises that you have not completely considered to the extent that they may be present. I really love the things SETs excel at particularly the rich, organic natural timbre of instruments that eludes most amplifiers, you can just relax into the music in a way that is most compelling. It's your money and I wouldn't comment other than you are accepting what others say without the benefit of listening first to be sure. Then on the other hand, maybe you need a change. If at all possible I would look at an 845 based SET that has more power that won't compromise the great aspects of the Manley, dynamics and drive with the magic of SET. It seems to me the Magnetic Line would be a GREAT choice although a bit more than you are willing to spend. Remember, 8 watts would be better suited with a more efficient speaker. I'm not too sure the DeCapo's are efficient enough for long term satisfaction. Since Brownfan is the only one in the know in this matter and his listening choices for THAT set-up is primarily in a bedroom for primarily string quartets, I'm sure the Franks will be, without question, his ultimate choice, you may wait until he puts up the Dynamo for sale or save your dough for the Magenetic Line 518i, which looks like a real bargain for all it offers. 22 watts vs 8. A 1.3K amp is not going to provide EVERYTHING and then some over your Manleys. Maybe you can borrow one to listen first?