I know I should be making my own and will this winter but I been getting this stuff from Ed's Roadhouse Jerky and it's awesome. I get the Lil's Smokey Sweet and Spicy which is a BBQ hot/sweet flavor and a Sweet and Spicy Thai Pepper which is the same but with asian flavor and hotness. They take forever to ship it and it ain't cheap but it's so damn good.
I have a buddy that knocks out a big sack of deer jerky every year, so I never mess with the beef variety.