If the Dub boards have rims on them, then I say buy it.
If you've got money to burn, buy all good stuff now. If you're normal and on a budget, buy a lower end board like 5150, cheap (but not the cheapest) bindings and good boots. And by "good boots", I mean the ones that fit your feet very well because a learning curve will suffer more from bad fitting boots than a cheapo board.
you want boots that fit right, but you don't want cheap boots, either. Some of those low end board brands also make boots, and they're really shitty. Get the cheap boards and maybe bindings (although those can be really crappy, too), but cheap boots are the worst.
If you have the money, go for more respectable brands (Ride, K2, Lib-Tech, GNU, Capita, Rome, Burton... among others). If you want to just start snowboarding and plan on saving up for a really nice board though, just go for it. Most important thing is that you're out there shredding it up.
True, but the question is would a new rider know how to spot a good used board off craigslist? I've seen some nice decks that have coreshots and edge damage selling as "minor cosmetic damage". Think of all the posts we see here "is this a good deal?" and the board looks like it was ridden on rocks