just got my new rig and I cant decide what team based F2P shooter to play

Evolve?

Well Paladins should be a decent substitute of Overwatch, but nothing would be close to Overwatch.

Block n Load :)

New rig? Drop f2p and invest some money in Battlefield 1. I've been playing almost daily since the release, its awesome

And if not, just return to tf2

Getting an awesome new computer and then playing F2P multiplayer games on it seems like casting pearls before swine to me personally.

Paladins is fun, gotta say

OVERWATCH

Paladins is worth a shot IMO.

-> Planetside 2 <-
Or Mountain (pretty good benchmark to test your PC)

Unturned?

Survarium, srsly try it!)

I went from playing TF2/CSGO to Overwatch and I havent looked back since, so I would also say Overwatch as well.