Awesome, vaporisers - my department of expertise considering it's 99% of what I use! Da buddah is a killer whip vape for under 200, the Herbalaire system is just about 200 (depending on where you buy it, I got my whole setup for 181 2 years ago, still going strong) and is a KILLER bag vape.
How I use it:
Bag about 2.25 ft long (fillable space).
Bag 1: 350-355F (turn it up halfway through)
Bag 2: 360-375F (turn it up halfway through)
Bag 3: 375F
Bag 4: 400F
^^^This changes based on how big you make your bag. I have a tiny 3 hitter bag right now and I do most of my bags at 350, skip 375 and go for 400. Play around.