Actually, the quality and performance of the various "stage" clutches can be quite different. This makes it hard to give a straight answer. Also, what is acceptable driveability to you might not be acceptable to me.Here is what I recommend:
http://auto.howstuffworks.com/clutch.htmI know you already know most of this, but there are some nuggets of gold in there that most people ignore or simply do not know about clutches. Be sure to access the extra links. Read and understand what marcel is for, why pucks deliver greater holding power and what a sprung hub is REALLY for. Learning about the various friction materials will also make you a very knowledgeable buyer.Now that you know exactly what to expect from a clutch, when you look at the "stage" you can get a better understanding of what they are really offering. Sometimes a higher stage is better. Sometimes its just marketing. By now you will be able to tell the difference.
And the most important thing of all.... call the dealer and have them tell you exactly how it performs in your car. They sell it, they should know it better than anybody else. If they don't, don't buy it. If they won't stand by their recommendation either, shop somewhere else. If they only sell clutches by their "stage" and cannot offer you any other reason than its a higher "stage", then they don't know clutches and you shouldn't buy from them. Also, buying a clutch based on its "stage" is a HUGE lapse in judgement.Learn from my mistakes.
I know this was long and I'm sorry, but this question is asked almost daily, so I figgured I'd try and cover it all in one poop.