Not a case guy, but phanteks? If you can't find a pump mount in a case stock, there's brackets that mount to radiators for pump/res combos.
Drive bay reservoirs save space and no need for brackets. I am currently using two koolance rp-452x2 reservoirs in my case, one for each loop. Just another option
Honestly Jeff, not very much. Under *extreme* conditions, a thicker radiator with good static pressure fans will be able to dissipate more heat than a thin radiator, but that's with fans at full blast and LOTS of heat in the loop. Now if you run a loop you know is 'undersized' in terms of rad space, like running a dual GPU + CPU on a single 360 radiator, that thickness would matter more. Under normal conditions, in a 'properly' sized loop, the difference is minimal. Also if you're still case hunting, I have a recommendation, but I feel weird saying that since I don't have the case yet, LOL. I've been doing some research on a new case too and have been water cooling for years. I just ordered the Lian-Li O11 Dynamic XL, in white. It's a rare gem, as far as I can tell. It's not overpriced, it can hold three 360 radiators at once, the layout is genius, cable management system is genius, has 4 hot swap SATA bays for 3.5" and/or 2.5" drives, and it's sexy AF. Anyone who watches custom builds on YouTube is probably sick and tired of seeing that case, but you can't beat the functionality at that price point.
