Ok, so 100Mb is not magically more than 64Mb.. In fact it does not matter too much to me as long as it sounds good.
To be honest, I don't need very much better sounds, I'm looking for other upgrades in 3k, like 3 intro/ending buttons, able to change upper octave and transpose without having to press the damn button twice, USB and few other minor things. Plus I like the way it looks