Light-Sport Aircraft Yahoo group Help me Understand This LSA thing.

I am an A&P and pilot, single engine land, and new to this forum. I could not pass a medical even if I bribed a med examiner, so have not tried. This LSA thing has me very interested, but I am having trouble understanding it all. Here are some questions I would love some feedback on:
1. As an A&P, am I correct in believing that I can do maintenance and perform annuals on any LSA? Does that include aircraft like say an Ercoupe?
2. There are two LSA, the SlSA that is factory assembled, and ESLA that apparently is a homebuilt. My question is, if I buy a kit from a certified SLA maker, I can assemble that plane only according to their specs. If I deviate from those plans, then what do I have? What about a kit from a kit maker that does NOT have an "approved" model to make kits from? What is the difference?
3. I want to acquire the absolute fastest, dependable, and most comfortable LSA available for longer distance use. Which ones should I be looking at?
If anyone has a source of this information, or will help me understand this, please feel free to do so.

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