Key word you mentioned is "pork" . And I am going to assume you are talking about pork butts. And you sound picky about it being done properly. With that in mind, your going to want anywhere from a 6hr to a 12hr smoke. and you have a $80 to $150 price range.
So here is my advise/opinion, ( and your fixing to get many) about your best two options.
option A: go with a cheap dept. store offset style smoker, the off set style will allow you to reload easier than a verticle smoker for those long smokes. Take care off it and there are plenty of modifications you can do to make them more efficient, plus more cooking room.
option b: Go with a propane verticle smoker like a master built. It will be in your price range, you will have to add chips for flavor, but after four hours it really doent need it anymore and the propane will give you consistent heat so you can sleep with out having to worry about the fire going out. It wont be the same as a real wood fired smoker, but they can still turn out darn good.