I like Steve's setup but I don't think you will ever clear all the dust from the top, as for under the saw, I set up a shop vac with the same idea as Steve and found it to noisy, ok ear protectors/muffs but I hate them.
I set up a small box under the saw to catch the dust and clean it at the end of the day, easy no expense.
But as for the top no answer yet, I'm broke and still thinking.
Just my 1.5 cents worth if it's worth that much. LOL.
***Merlin***