I've really been on a short runner log manifold bottom mount craze lately. If I did it again, I'd do a bottom mount log manifold with a twin scroll turbo and water lines. People do not need 800whp+ for daily driving or even most racing and anyone exceeding that threshold is making a purpose built car in my opinion. 3.0L engines just don't retain the daily driving aspect when making big power. You can argue that upgraded twins can meet these needs but I'd like to see more third party reports of 800+ before I agree with that.
The other thing I've been high on is a true big twin option, like the VTT Stage 3 or the CPE Atmosphere kit, but both of those are out of your price range.