I'm currently in 2018-2019 season and most established players have retired by now so get genie scout 12 to find the real gems, however here are some of the best non-regen players in the world:
Aaron Ramsey - 30m best midfielder on the game
Lorenzo criestig - 20m absolute monster if he gets games, second best dm in the world.
josh mceachran - 37.5m Intelligent midfield boss, usually he's rotting in chelsea's reserves so you can get him
cheap.
sergio araujo - 29m Just class!
Carlos fierro - 19m stats are deceiving he is by far the most consistent goal scorer on the game.
Alex chamberlaind - 30m Alex has a PA of 180, if he's getting played he easily is one of the best wingers.
Michael lawal - 72m not sure if he's a regen he appeared in the south african leagues in 2012 in my game
BEAST!!!!
douglas costa - 27m best winger on the game probably.
felipe anderson - 22m creative playmaker
antoine griezman -39m Just class winger
lucas moura - amazing winger
kyle walker
stefan bell
kyrakious papadopolous
gael kakuta
thomas muller
david de gea
andre schurlle
iker munian
phil jones
these are the best players in the world in 2018-2019 based on CA and positional ability.
obv players like Hazard, messi, Gotze, hamsik etc don't really need mentioning .
however i did manage pick messi up on a free from barca when he was 30 and the guy is still scoring 30 goals a year now he's 33! hope this helps