Thanks to all for your thoughtful and helpful insights and suggestions. Much appreciated!
Sting Ray - you are correct in that I saw the BackScatter review. The review spoke to all the features that I am looking for in my next set up. Also, thanks for the strobe recommendations. You can't beat their size and price point is good.
SeaNettle - wow, what great footage with NO lights. Very impressive for sure.
Wolf Eel - you sold me! I am definitely getting a vacuum system.
Any suggestions for wide angle and macro lenses? I tend to purchase at the middle range versus inexpensive or top of the line. Finally, it seems like Nauticam is the best for housing. Are there solid housing products that are a step below - maybe middle of the road?