What I advise anyone who is starting now, and wants the vintage greenback tone, without spending a lot of money, is to get a quality 4x12 and load them with Scumbacks. I really like some of the new greenbacks too, especially the Heritage 20w, the EVH(same as the 20w), the 30w... but I like the Scumbacks even more.
The Scumbacks do sound closer to my favorite 60's Greenbacks than new greenbacks do, and are way more consistent than the new Greenbacks and the old cabs and speakers that survived the last 60 years of use and or abuse.
Now, if you come across one of the old original cabs that sounds magical, no other cabinet/speaker combo will beat it. I was lucky enough to come across(not to mention that hunting for gear was most of what I did my entire life) a few magical ones that are pretty much impossible to beat tone wise.
One of them, is still unbeatable since 2003, and it's a 20w 75hz "slant" cab. Best sounding cabinet I've ever heard.
So yes, if you have the money and time to do it, go hunt for yours. If you want to save yourself the hassle, get a god cab and load it with Scumbacks and you'll be as close as you can get to the real deal.