I haven't gotten around to Ortega yet, but I'm growing their SHIT right now, and I'm very impressed. SHIT is an inbred Skunk line. Ortega is an inbred Northern Lights line which contains the legendary NL5, if I'm not mistaken. If you want pure, original NL, its the best choice in my opinion. I don't want to participate in any cannabis lore related pissing contests, but I'll venture to say that Shanti/Nevil stock is where you want to go for old school genetics for reasons stated by Easy7. Its certainly why I went to them for my Skunk run.
Go on their auction site and have yourself a time. They auction off old beans by weight for very little money. I highly recommend you pick up a pack of SHIT for the vault, as well.