Expertlogo seems very well designed and easy for me to use. I spoke to them on the phone - they are willing to do a lot more to get it personalized than what I expected. Also if you are a member of SGIA you get a substantial discount.
These are some companies that they gave me as references that use expertlogo . . .
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www.apparelbuilder.com
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www.inkontees.com
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www.safarisun.net
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www.coloranywear.com
I think I am going to use them.