Yeah those traegers are pretty cool, a bit expensive...but in this case I would say it's totally worth it...cause It's for cooking MEAT! Looks like the cheapest model is about $429.00, not bad.
That being said the ol' propane cabinet smokers are good as well too. I just did a batch of yellowfin tuna on monday and it was insane! You'll probably have more capacity vs the traeger, having multiple racks and all. You also need one of these....