I can only comment on the SME 20/2A, which I purchased last year. I love it. It took me an evening to set up, and is provided with well written instructions, which were relatively simple to follow. It is a simple design, and pretty much fuss-free. By the way, it sounds really nice too.
As for which component to upgrade first, I have no idea, but do remember that a preamp upgrade will benefit your whole system, while a table upgrade will improve only your vinyl listening.
As for which component to upgrade first, I have no idea, but do remember that a preamp upgrade will benefit your whole system, while a table upgrade will improve only your vinyl listening.