Busta,
If you're like me, you like the mojo of old gear. Fun to keep it running. If you want to upgrade. look at the Q-Cove type flashers. they have a pin that pulls out and releases the resistance of the flasher when fighting a fish. I like those.
In answer to "How many flashers do you need?", the answer is 17. That's what I have from over the years...you'll have to buy 5 more!