My answer to the question of what's better with pronounceable vs good 4 letters, I would say that for a quick cheap sale(4-15 x reg fee), the pronounceable word is better as there are more uses for the domain.
But, for a good sale price (>50 x reg fee) the good letters are better as there is a higher probability that there is a particular organisation that is using those 4 letters for some acronym that they can't afford to change the letters because the acronym was decided on in the past.
It all depends on whether you want money tomorrow or are waiting for the bigger fish.
Duhf.com has the best letters and sounds best. Definately the best of what you've shown.