The Bailey DV30 is the loudest DV I've used, noticably louder than the Forge 007P. The Forge Split-r will give you a bit more noise than a full re-circ. DV.
If you want to go fully atmospheric, you take your chances as there is no guarantee your car will like it. But the only two BOV's that have worked for me are the HKS SSQV and the Collins. So far the Collins has caused ZERO problems - no stalling, backfiring, lag, rich running, sooty exhaust or plugs ... nothing, and it sounds awesome!