Brushless ESC for a 540 converted micro RS4

[studysession]

Hi -

I am looking ofr a small sized but a powerful ESC. I have a Micro RS4 that can accept 540 size motors. Here is a link to pics of my car:
http://studysession.com/Car-MicroRS4.html

I am putting a 540 sized S series brushless motor in it. I need an ESC small enough to fit with RX in the car. But powerful enough to run a Hacker C40-5T motor.

Any ideas? Thanks.....