opinions on my build

[w00tah]

The crossovers are way too low for the tweets you have. You'd want a set that are crossed in the 4-5khz range or get different tweeters.

2 way passive crossovers are generally a fixed crossover point.

I think if you are dead set at keeping those 8" midbasses, you should build kick panels for them, and run your component set. Run a 3 way crossover, and have the midbass to midrange at 500hz, and the midrange to tweeter at 3khz. Would give you the best sound with the gear you have.