Well, out of the 3 originals, I would have to say the Seas Lotus. Only because the Focals are way out of the price range, and there is no such thing as the Momo SR6500 (It's just the Polk SR6500. The Momo speakers are a comletely different line).
Seriously, though, you really should audition them for yourself. I couldn't spend that much money without making sure beforehand that the speakers would give me what I want. I could plop down the cash on a set of Germs, because they have recieved tons of great reviews in many kinds of installs and using many kinds of music. Plus, working with 6spdcoupe, I know I'd be taken care of if I had any problems.
You can't really go wrong with either set, but it would be difficult for us to tell you which is better.