I'm an 1.e4 player and i play the normal english attack against najdorf/scheveningen/Taimanov with very good results.Now i have a question regarding the 6...e5 variation after 6.Be3.The line goes 1.e4 c5 2.Nf3 d6 3.d4 cd4 4.Nd4 Nf6 5.Nc3 a6 6.Be3 e5 7.Nb3..now black has two main choices 7..Be6 and 7...Be7,i was wondering is insted of 8.f3 now,what if white playes 8.f4!?.Ive seen some games with not so bad results for white.White attacks the centre immedietly and maybe castle long with h3 and g4 to follow,with attacking and positional chances...i want to know your openion.. 

Thanks