Best Coin/Alt to mine? & Software

[felipeintheend]

Hello. I am newbie into this mining world. So... if my question offend you, I am sorry.
I am seriously thinking amout buliding a rig to mine... But, I'd like to ask tips for experienced users for first.

Which algorithms is the best to mine investing 7k (USD)?
I was thinking about cryptonight with 10 VEGA 56 - which should give me a rate of 17-20 KH/s.  Which would give me 40-50USD daily in Monero.

What do you guys think? Gimme a help here!

Thank you