Well, the published max is probably from the winmo specs, for WinMo 6.1, who knows under 6.5 or android.
In regards to the other part of your question, the higher the class, the better (in theory.)
current device / ROM:
galnex - cm10.1
VX-10 | VX-7000 | VX-8600 | XV6900 (HTC Vogue) | XV6850 (HTC Raphael) | Droid 2 | HTC Droid Incredible | HTC Thunderbolt | Samsung Galaxy Nexus
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