Haan, there are many permutations and combinations but after much research I can assure you that what i Bought is probably the cheapest no-compromise (or should i say no major compromise) option among the cheap tripath amps. But if you have your own power supply or have access to one, then by all means by the one without the PSU, but go for the 2020 and not the 2024, that one watt extra power per channel makes a difference when it's such a small amp.
I am still waiting for more feedback. None of the guys with 'serious hi-fi' setups want to take a chance on this? I should really do some kind of road show. Travel around the country with the topping, plonk it into people's high-end setups and see if they like it

Like Edison's "Tone Tests"