Apex Trigger kit for M&P?

I just purchased me an "election" pistol. I like to purchase a pistol each election as a token of celebration or to make me feel better. Either way....I get a new pistol.
I purchased an M&P 9. I see many people are dropping in Apex trigger kits; however, I see so many different listings on ebay with a wide range in price. Can someone help me choose the correct Apex kit? A link would help.
Any other mods I should make...that don't break the bank? Grips?

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Apex Trigger kit for M&P?