Nomad, go with the medium case! No question. WAY more ratios and LSD options. I'll be putting in a 3.91 lsd out of a 325 really soon. This is on an e36 by the way.
Are you doing this on an e30 or e36? e30 I believe has a few options such as a 4.10 and 4.45 (

) I'll have to do some cross referencing on the ETK. I'm more familiar with the e36 diff swap though.
Where in Socal are you? PM me if you'd like some help with the swap!
