pls advice on best courier service in US

[mitrkk]

am basically from Chicago suburbs and have to send the documents to the Chicago consulate..pls suggest the best courier service i could use..
i called Abriggs but they tell me that I have to drop my documents at their place and they will deliver it to the consulate..basically their office is located in Chicago and the consulate is in downtown as well..I would rather drop them by myself and save some money...(ofcourse, i did not select the drop off option on my online application) ..

seniors please suggest

thanks,
KK