I started my Career at AS Monaco with a really poor budget, which made winning games a pain in the a** at times,
But the first player I bought on my current career was Jorge Henrique from Corinthians, he is rated 75 overall and valued at £2M. I'm now in my 2019/2020 season with St.Etienne with a yearly budget of £150M but I still always use Jorge Henrique purely because he is an amazing player! Looking at his stats there is nothing special except his great speed and long range shooting, Even if you are managing a top club I would recommend still buying him as a 2nd Striker.
Also I would Recommend M.Traore from OGC Nice, he is rated 77* and relatively cheap, oh and he has a blistering long shot!
But my all-time favorite buy Has to be Jeff Louis from Le Mans, I just bought him in my 2018 season for £4.5M and he is now rated 79 with 99 Stamina, and 99 Balance