I just completed a build in a Phanteks Pro M SE. I love it. Has great airflow and room to mount a custom loop.
It has the same basic layout as the 600S but is shorter.
I wish the 600S was out when i was parting out this build as I would have paid up for that case. Then I could have put a 420 rad in the front instead of just a 280...
Build: msi C8r (Carbon8r)
Core i7-9700K OC 5 GHz, MSI Z390 GAMING PRO CARBON Mobo, AMD Radeon VII GPU OC 2K MHz, Corsair Vengeance RGB 32GB DDR4-3200 RAM, Phanteks Enthoo Pro M SE ATX Case.
XSPC RayStorm Pro CPU w/b, Bykski Radeon VII GPU w/b, EKWB 140 Revo D5 Pump & Res.
Aquacomputer Aquaero 6 LT USB Fan-Controller, Vision Touch and 'High Flow' Sensor.
(2x) Hardware Labs Black ice Nemesis 280GTS XFLOW radiators and (1x) Alphacool NexXxoS XT45X-Flow 140 in full push/pull.