It's a bit pricey now, but if you can find it reasonably priced, I'd recommend this box set...
https://www.amazon.com/BOXSET-Orange-Goblin/dp/B004V9IYTA/ref=sr_1_9?s=music&ie=UTF8&qid=1473365422&sr=1-9&keywords=orange+goblin
It's their first 5 albums with lotsa bonus tracks for each album. I purchased it some time ago after a particularly profitable game of Texas Hold'em if memory serve me.
I think all their stuff is good, but I have noticed that their older material has a bit more of a stoner/psychedelic vibe. Not that there's anything wrong with that. Their last few have been more straight-up biker metal.
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I used to be with it, but then they changed what "it" was. Now what I'm with isn't it, and what's it seems weird and scary to me, and it'll happen to you, too.