Well supposedly the 5.1 has more upgrades available for it however I really like the feel of the 4.3 myself (I don't own one however I've handled my teammates new 4.3).
Also I don't think so although I'd like to see one getting going on the West Coast. You could probably start a CAPS league if you really wanted however being new and inexperienced usually leads to bad things happening. Getting some games under your belt is the first priority, secondly once you get known ask if you can start to co-host games (or at least shadow game admins), finally try starting a CAPS league with one of the people you've co-hosted with/shadowed and once you get confident enough you can probably start hosting them on your own CAPS games.
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE