Sicilian Opening Help

Feldmm1's posted line 1. e4 c5 2. Bc4 e6 3. Nc3 a6 4. a4 Nc6 is quite standard - I play it automatically [strictly speaking - if white co-operates on move 3 and 4 - i can't make white's moves when playing black ;)]
Feldmm1's posted line 1. e4 c5 2. Bc4 e6 3. Nc3 a6 4. a4 Nc6 is quite standard - I play it automatically [strictly speaking - if white co-operates on move 3 and 4 - i can't make white's moves when playing black ;)]
This situation happens 80% of the time I play, yet I can't seem to find something usefull to play.
What are my 2 best bets in this situation. I usually do Kc6, but it feels flavourless and not so usefull.