Amazon has the 20070311 w/ top controller for $296 and the 20070512 w/ front controller for $300. Both appear to have 1200W elements and the front window. Other than controller location, what are the difference between the two and, more importantly, which one should I order? Or, should I wait for the "new" model 20075315 that Amazon lists as a replacement for the 20070512, supposedly coming out in 4-6 months? I don't *need* a smoker right now, and would be okay waiting for the new model if it's worth it. The only difference is I see in the picture though is a top vent. Does anyone know anything about this "new" model?