Go for the MA750s then. Read the latest impression of them on the MA750 thread..I like the Gratitudes for the price we payed them for but if you have to pay a bit margin more for the MA750..The MA750 is technically a superior earphone, better sense of space and depth. More even balanced sound better natural timbre especially in the highs.. Way better build too actually.
The overall presentation of the MA750 is well rounded and superbly balanced where the Gratitudes have a cone shape sound, the treble is thin and leaner vs the bit thicker mids that aren't as deep as I would like and then add to that a thicker bass end..The Gratitudes are colored in an enjoyable way and they do sound awesome for pop rock but if you really want to get down to what has the higher end sound quality.. I have to give the edge to the MA750s.