Hope things are well, Pubul57. I presume the speakers your speakers are still Merlins?
Presuming the speakers are Merlins, either of the two amplifiers will be fine, though they will sound different. The DA30 will be a touch sweeter, with subtly better midrange. Aside from your having ever used a solid state muscle amp, the DA60 will likely produce the best low end you've heard with them, though quite different than that of an OTL design, and still retain that beautiful midrange and overall sound you buy a tube amplifier for.
It's really a question of where your tastes lie. As for me, I ALWAYS prefer to hear two components next to each other myself. I don't care who they are, no other person can really provide If you're within driving distance, feel free to get together for the purpose of evaluating which amp you prefer with your loudspeakers.