I should also that Synthracks have very nice cases:
https://synthracks.com/6u-eurorack-cases
They also have a bunch of things like rails, rail brackets, helpful things with custom case building:
https://synthracks.com/rails-frames
https://synthracks.com/fixings
for a 6U case I would probably go for a 2x 3U TipTiop Audio uZeus power supplies and for larger builds such as 9U I would maybe consider a 3U TipTop Audio Dual Access connecting to 3x TipTop Audio Studio Bus Boards
http://www.tiptopaudio.com/zeusmicro.php
http://www.tiptopaudio.com/zeusxs.php?goto=dual
http://www.tiptopaudio.com/zeussb.php
http://www.tiptopaudio.com/zeusbua.php
4ms Pedals also offer a great range of power supply for eurorack:
http://www.4mspedals.com/rp-overview.php
Hope some of this info helps you on your eurorack adventures.