dvdslw

Is there anyone who can shed some light on all of the different variants of the Hollowgram Crank over the years? I'm in the middle of a component upgrade and have been considering a Hollowgram crank with a mid compact spidering. In my search for piecing together a crank I find there's the Hollowgram SI, SL, SISL, and SISL2 to choose from plus there's also a non Hollowgram version of the SI. I know that the SISL2's are the lightest and most expensive but out of my budget so out of the other variants, what should I look for or stay away from?

I want the mid compact 10 arm spidering along with the SISL2 spindle and hardware, just need to know which arms to look for. Thanks!