I think STA Phaser will be great with subtle use. I haven’t used it yet, but can imagine it will be useful tool. Just strap it across a couple of buses as an insert, as per recommendation and get tweaking!
Checkout the video below!
DAW application supporting VST 2.4/VST 3/AAX/AU (Mac only) formats
CPU with SSE2 support (Intel Pentium 4 or AMD Athlon 64 and newer), Windows Vista, Windows 7, 8 (32-bit/64-bit)
Intel Core, Mac OS X 10.7, 10.8, 10.9, 10.10
CPU speed 1.5 GHz, 50 MB of HDD space, Screen resolution at least 1024×768 (recommended 1280×800 and more)