I have the RI GB's in most of my cabs, but two cabs have original GB's that the HGB's are taken from (T1511 20 watt with bass cones). My old ones have tighter bass and are clearer than the RI. I do really like these! I think the RI sound fine for what they are, but if you want the extra clarity and low end the HGb's might be good.
The H30' Heritage I don't have any experience with. The reg H30's I don't think are that great, too scooped in the upper mid range, very dark sounding. Weird speaker! I'll most likely move mine soon.....I cant see wasting the $$$ on the Heritage H30's.
I tried the H65s recently and they are ok, not really worth the $$$. Not really that different from the RI GB's tonewise (less bass and treble). In a 2-12 application they would be good for the power handling.