I realised that the instructions I gave above dont make any sense.... Ignore them, here is what I'm ACTUALLY thinking
My reasoning is this:
for the pump: straight barbs
because the In/Out comes straight out of the back... the CPU (our first stop) and the RAD in the front (our previous stop) are both a good distance away, no sharp bends (i think) here. Maybe I should do one 90 degree bend on the IN, since the radiator is below the pump and tubing has to get around the drive bay cage?
for the CPU: probably two straight
Nothing looks too cramped at this step
for the top radiator: two straight
If I put the In/Out of this radiator against the back wall of the case, there shouldn't be any awkward angles here either.
I've changed my mind for the GPU. Look here
The I/O of the GPU runs parallel to the motherboard, but points AWAY from the top of the case (where the tubing is coming from). It doesn't seem ideal to have the tubing wrapped around the card 180 degrees (since the tubing is coming from the top of the case, but needs to enter the waterblock from the bottom of the case). Can I do anything to fix this? Are there any fittings that can help here?
The output of the GPU doesn't appear to be a problem. Probably a 90 degree barb here.. to send it off in the right direction toward the front of the case.
for the bottom radiator: two straight
Everything here is pretty roomy... I see no reason to use any barbs with a bend.