the equipment you showed in your second post would work together but you would be lacking in your highs. i would add a tweeter and try to find a three way crossover so you can run all three.
another option which you said you werent sure about is going active and using a separate amp to power the midbass, midrange, and tweeters. You can do this with a 5 channel amp and an active crossover like the kx3. have 2 channels for left/right mids, 2 channels for left/right tweeters, and 1 channel for your seleniums