Audi 01E codes

Hi, I know much has already been discussed about the 01E and apologise if anyone feels I am recycling but just wondered if there is any better information around now regarding choice of 01E gearbox to use. I recently had an issue with the gearbox I had originally fitted to the car and during the investigation found the box was not as expertly rebuilt as I was led to believe. I have a spare that is currently being prepared ready to install but would like to acquire another, the two I have are DQS code boxes which from memory have wide 1st gear and long ratios. Can anyone offer advice on other codes that are as good or better. Also of help would be any advice regarding ATB LSD's, pro's and con's of which ever brands have been used.