The margin of difference in quality from one snowboard manufacturer to another is declining rapidly. That's not to say that one company doesn't make better boards than another, but it's less of an issue than it used to be.
Almost every company has at least a few models that are of good quality, and would suit your needs.
Some companies, however, have had an upper hand for quite some time, and deserve mention. These manufacturers can be counted on, no matter what board you buy from them, to make quality products that will last many years and allow you to progress on one deck. Among them, Gnu, Lib-Tech, Ride, Option, and NeverSummer. If you go with one of those, you can't go wrong.
Of the companies you listed, Roxy makes alot of stuff directed at female riders. Burton is over-priced, and even more over-rated. Nitro and Ride both make good decks. Haven't heard much about Avalanche or M4....