Amp upgrade recommendations

I am considering having a pair of DNA 0.5s upgraded to Rev A and converted to monoblocks to run balanced off of my BAT VK3i, which is driven by a CAL CL-10/Classe' DAC also running balanced. Speakers are Vandersteen 3Asigs. Or I could sell the amps and buy something else. The mono-block conversion and upgrade is $1800; amps would yield about $1400-1500.00 (one is already Rev B) if I sold them. Any thoughts on which route might be better? I do not want to get involved with a tube power amp. Thanks for your ideas.