To be honest, I think Bale has a few years yet before he can be considered to be in the Beckham/Scholes/Gazza bracket. They're more a benchmark for him than the other way around.
I'd rate Bale over all of those apart from Gazza. There are mega stars Maradona, Pele, Ronaldo, Messi, Best, then another class of footballer that Beckham / Scholes belong, current generation Aguero, Suarez, Silva, Bale etc.
I think you add Bale to Chelsea, Man City, Arsenal or Man Utd and that team wins the League.
Gazza was somewhere in the middle.