So I played and drew.. it went ok I tried the 4..e5!?  line and my opponent responded 5.Nf3.  I wasn't quite sure what to do, 5..e4 was tempting but I didn't want to do anything rash.   

What is recommended against 5.Nf3   ?

Hi guys I'm playing a tournament game tonight with black against a tough opponent.  I know in the line 1.d4 Nf6 2.c4 c5 , he will play 3.Nf3.  I've had little experience against this line so now I am kinda hoping for insights as to how to play.

My first instinct would be to play after 3..cxd4 4.Nxc4 , 4..d6 or 4..g6 and go for the ..d6,..g6,..Nc6,..0-0,..Bd7,..Rc8 setup.. similar to a dragon sicilian I guess.

But I've been hearing that 4..e5!? Is a sharp alternative which is I must admit tempting.

Does anyone have any experience with either of these lines?  If white responds 5.Nc2, I plan to play b5, and against 5.Nb5 I'll try 5..d6.   What about 5.Nf3 or 5. Nb3 ???   

Any help or advice on any of the above lines is much appreciated.. I need to win this game!!!!