Slowly rowlin(maxx build)

Okay I am new to this forum and have been browsing through existing threads searching for answers to my questions but I think I'll make my own thread so they can all be answered in one place. I will be building on my almost stock E-maxx but have no money so the parts will be coming in slow; hence the name, "slowly rowlin".
Right now the only things I have done to it are- A spool in the rear with revo shafts to handle the beating it takes. uuuhm and thats it lol. So the revo shafts didn't do diddly. I took it out for a run then lost all power to one of the rear wheels. I like the added width with the revo axles and carriers so I will be getting revo cvds for the front and rear. Here is a sorta list for the parts I intend to have on the truck.
-RPM Revo axle carriers all around.
-RPM Emaxx A arms all around.
-MIP Revo cvds.
-Feigao 540 9xl B/l motor.
-Quarks 125b B/l esc.
-maxamps 3s lipo packs x2.
-single speed transmission.
blah blah blah.
The questions I have are with the FLM hybrid bulks, what diffs do you use? Also anyone with them, how do you like em? I will probably upgrade the chassis close to last because its not all that important yet. The main thing I want to do now is get the drive train ready and shave some weight but everyone is out of the single speed. I will most likely run a tekno wingmount and 1:8 wing along with a crowd pleazer muscle body along with either wabash or dish 40 series. I would like to keep this truck as light as possible. one of the main things I am having a problem with is the spool vs. diff issue lol. also the bulks.Well I wish I could take pics but my cam died. I might get some from me mums phone. Well more later.