You'll get lots of different opinions about what combos to run on the tower (and everywhere else). I mated some Rev 8's to an existing Stealth Core 10 sound bar, with plenty of amplification to each.
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That combination PROJECTS. The sound bar does a great job punching through the mids and highs. It neither overpowers the Rev 8's, nor is it overpowered by them.
Now, if my boat didn't already have the sound bar from the factory, would I have still added it? Probably so, but perhaps as much for how it sits on the tower (completely out of the way of everyone and everything) as how it sounds. The Rev 8's are placed right above the seats, and it's virtually impossible for someone to hit their head on them. The sound bar, of course, is right in the middle, and at virtually the same level as the tower. So no one hits that either. If I had put a 410 (or another pair of Rev 8's) there, or even mounted it on the forward tube of the tower, I'm not sure it wouldn't get in the way on regular basis.
Jeff