Starting out in modern - don't know how to start.

Hey there

I'll go straight to the point - my LGS is starting with modern nights on the 10th of March, after our last Standard RCQ is fired. I don't have a modern deck, I only have an UB midrange in Standard and two pioneer decks, plus an odd assortment of cards, no modern staples.

I've been trying to figure out which modern deck could I buy, but I've burnt out. I don't know which one deck to buy based on price, gameplay and longevity. I only have about 400$ atm, been looking at UR prowess, but I've seen it's winrate is low, around 44% or so. I'm honestly at my wits end trying to figure out what to do, and I can't find one deck I'd like to commit, either because I'm too low on funds, or don't know if it's going to be something I'd enjoy for the whole RCQ season.

Bottom line, I'm confused and not sure how to handle buying my first modern deck - and not be a laughingstock at my LGS (they're all meta deck players).