Re: New & need advice, questions answered etc...
most of the inframe 2 strokes are chinese. you can get some japanese motors, but they tend to be rear mount friction drives.
the 48 vs 66cc argument tends to be similar speeds on flats, but better hill climbing on the 66cc. as you mentioned some states limit your size options, some even lower then below 50cc, theres all sorts of grey areas with these things in most states.
as far as brands you'll get mixed reviews of everything except the higher end models for the most part, i have a grubee skyhawk GT-5 and i'm satisfied with it, but if i ask another member here he tells me grubees are awful and this other no name brand is better.
i haven't used another brand so i can't say for sure, but generally reviews are mixed.