Need an innovative logo design for a Mobile Coffee Vendor/Shop

Grouchy John's

Hello, I'm Grouchy John and I serve coffee, espresso, and smoothie drinks at events around the Las Vegas area. I'm really not that grouchy but do have a love for quality coffee and can never get enough of it. When working events we keep things fun by wearing weird or funny hats and engage the customer at all times. I'm looking for a design that is fun and captures the spirit of the brand name without being too loud.

Since I work a lot of events (i.e. art festivals, farmers markets, etc.) I need something that I will be able to have on a banner that will attract passer by's while at the same time convey what type of service I provide.

I'm open to all ideas but would like something that really convey's the Grouchy John's brand. I would see my likeness as a grouchy character in the logo either making the coffee or drinking coffee and the name. The typeface of the name needs to be clear enough to be read from a reasonable distance.

This is not bad but I'm looking for something less comical and a clear typeface:
http://novelistabarista.blogspot.co…e-guy.html

I really like this design as it is simple and conveys what they do very quickly.
http://www.jitteryjoes.com/

The files I will require are:
Print file format - .ai (CMYK)
Web file format - .jpg and layered .psd (RGB)

Please do not use any stock images or clip art in the logo

Also I have attached a file of me working an event.