I just bought a CT26, and saw the same info everywhere as well - they are all HEPA certified now. The big thing to think about is the accessories. The 26 and up have a different accessory profile than the mini/midi's. The boom arm was one of the clinchers for me as I plan to get one in the future. The 26 and up also has a hose exit out of the front instead of the top, which may be a consideration as well.