I've used 3 smokers and the Weber Smoky Mountain is my favorite. I used a horizontal offset for about 3 years prior, and the difference is like night and day. Not so much in the food quality, but the ease of use is amazing. (Of course, the ultimate in easy is to go electric or propane).
Its expensive up front, but I think of it as the cheapest in the higher grade of smokers. The Green Egg, Komodo, Grill King, and the WSM I group together as the WSM is incredibly efficient, like the ceramics. I was *this* close to getting an egg, but went WSM instead. I have not regretted it.