IMO Theta Basic II is still an excelent sounding dac for the (used) price. It eats most of the current budget players for breakfast. It is very highly sensitive to jitter though, so a good transport or a reclocking device is a must. I have tried both Theta TLC and Genesis Digital Lens, and the latter is vastly superior. It works magic on all Theta I have tried - Basic II, Basic III/IIIa, Prime II and Gen V/Va.
Do not be worried abot the bits thing - the Audio Note DAC 5 Sig, arguably the worlds best, is also 18 bit.
Do not be worried abot the bits thing - the Audio Note DAC 5 Sig, arguably the worlds best, is also 18 bit.