Back to the OP's original inquiry - If you have seen that most people have recommended Clean Cut blades, why are you buying other stuff? When I bought my new Graphtec, I had the Clean Cut blades in my hands well before the cutter even showed up at the warehouse for me to pick-up - because that's how awesome they are.
Blade depth is hugely important because that will help determine the longevity of the blade (see Scott's picture of the broken tip). That being said, you're not specifically telling us why you're needing to switch to a new one - is the tip broken? do you feel that it's just too dull? is it tearing up the vinyl?
In my case, the blade angle (45 or 60), down force, and speed are determined on a case by case basis of material that I'm cutting, the design (or intricacy of the design), color of vinyl and age of vinyl - because even I mostly cut with 651, the different colors are different ages, and some require more force for the best cut than others.
I know that you're looking for a blade that will last long, or at least longer than the USC blades you bought. I'm going to tell you right now that I've had a Clean Cut blade in my original LP and it's been there for the last 8+ years. I took the time to set the depth properly, and will adjust the cutter setting according what I'm cutting. Does it take time to make the adjustments on a case-by-case cut? yes, but it sure beats wasting my time because I've snapped off the tip and have to do the whole new blade set up.
Try a Clean Cut blade, take the time to set it up properly, and you should be good to go.