I have no relation to this company just answering the question here.
Try to find one of these (hard to do because people wont give them up) or they have a lease program I think.
The drill doctor made by the same company will do up to 3/4 inch bits.
I have this model and it was worth EVERY penny !!!
Ordered mine from http://www.grizzly.com but I think Local big box hardware stores carry them.