where did i say i liked/disliked kinetiks? i have no experience with them. so i cant give an opinion.
g31 is a group size, not a brand (no optima doesnt own the "g31" tag).
http://www.rtpnet.org/~teaa/bcigroup.html . the hc2400 is a g31 battery...aka a group 31 sized battery (meaning it fits within certain specifications)
as for the alt, sure you can step it up to a higher amperage unit. i was just stating 200A, as thats what me and a buddy run, and with a single g31 batt in the back (deka intimidator) and a g34 up front (deka intimidator, again), it works just dandy for 3kw. hell get the biggest alt you can afford. only ones i have seen for my car are 200A units, so thats what i went with.