start going through some of the pinned newbie threads, that should help you out with the various series and chronology...
yeah, the 1/48s are pricey and yeah, they're all big and yeah, they rule. you need at least one...
just check out kevin's store: www.valkyrie-exchange.com
he has the best versions of the various boot leg DVDs out there, his service is great and he ships fast.