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If you want something very good to read, I'd suggest Options as an Strategic Investment By Lawerance G. McMillian. It's about 1000 pages and well worth the read.
It starts out on a very simple level and ends with very advanced text, good for any level of options trader.
I personally think the more you know about options the better you will trade them.
The times where you are going to use the greeks are the times where you are setting up what are known as synthetic positons. A synthetic positon is one where you are buying and selling options and possibly the underlying to create a position or payoff that could otherwise not be recognized by using the components individually.
Implied volatility is a good indicator of how "expensive" an option is as it is basically a "plug" factor for excess value. If it's too expensive, you might consider setting up a spread (bull or bear)
What exactly do you want to get out of options trading? If you're sticking to the sytle you've been using and have been successful with, I'd say knowledge of the greeks and such is not absolutely needed, but it might help.
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