e-maxx user looking to go brushless need opinions

Thanks for all the info ill look at this stuff and think it out. This is a lot of money so I want to make sure its what I want to do. I have one more year of high school and then college so im not 100% set on this idea. Are any of you guys in college? I dont see any 1/8th scale diffs on UE's websight. I see the Hot Bodies diffs on here that are 1/8th. Whats the difference between the two on here. Do the hybird bulks come apart or are they one solid piece?