Hello!

I have a question about a variation in the 3...c5 Advance. There is a particular line that I'm having problems with:
1.e4 c6 2.d4 d5 3.e5 c5 4.dxc5 Nc6 5.Nf3 Bg4
and now 6.c3 is in my opinion an annoying move to meet. After the natural followup 6... e6 7.b4 I can't find anything better than 7... Bxf3 (Note that 7... Nxe5? 8.Qa4+ with Ne5 to follow is winning) 8.Qxf3 Nxe5 9.Bb5+ Nc6 10.0-0 Be7 11.Bf4 Nf6 12.Nd2 I think White is better, since he can easily protect his pawnmass with a3 and play natural moves like Rfe1 Rad1 and maybe c4 at the right moment. Black has a hard time playing for e5 and his queen hasn't an accessible square.

The normal 5th move is Be3 but in my opinion black has a harder time here..
any thoughts?