+1 with Stacy.
The JT actually seem more readable to me with the colored one. I also think you should put the Hand Made Knives back over the wheel, but maybe just in white (this time I think I'm with Patrice.)
I forget, is this going to be painted on, or something like magnetic vinyl, or something else?
Will you have brochures and/or business cards in the car to give to folks when they ask about it? Might should. Are you using something like your tattoo for your logo (not on the car, but on your printed material)?