i hate using jobber bits in the lathe you can actually see them twisting when you put them under a bit of load. i have gradually gone through all my drills and replaced them with dormer ones. im a bit sad though i have nice drills for using the in the lathe and cheepo ones for general abuse.
i use these guys
http://www.drill-service.co.uk/ they always sell top quality drills for a fair price and lucky for me they are 2mins down the road from work.