this is actually a VERY good question to be asking, medic91w.
if you want the #1 pros best material on the subject, you can go to
www.flourishman.com and check out the "DVD" section, he just released the third companion DVD (costs $30) that has an entire section on routining flourishes.
I find that flourishes CAN definitely complement a magic trick, do a one handed shuffle to show that the cards are mixed up, do a nice pressure fan or an armspread to display all the cards and show that it's not a "trick deck" or a forcing deck or something along those lines (but don't use the words, "force deck" with a layman audience)
anyways going on, do a giant fan and allow them to "pick a card" from the outer ring... riffle down the pack in dealer position and when they say "stop", do a hotshot cut to pick their card (you can catch it without seeing the face very easily)
now, Dan and Dave's flourishes are a little different because it simply does not make SENSE to a layman to "cut the deck" into FOURTEEN DIFFERENT PACKETS and balance one on your chin, or something. however there is some comedy material to be had there such as "let me make sure the cards are REALLY well mixed up" or something...
anyways the bottom line is, you have to determine for yourself how you would like to present your magic. some flourishers/magicians around here will tell you NEVER mix the two, for example Ineski, a very highly skilled card man, will say to even handle the cards kind of sloppy when doing magic
it's totally up to you!