If you want fairly neutral check into the eq popular with mastering studios, as they are doing just this: slight changes to completed stereo mixes. The prices do go up. A great yet lesser known company to look at is Gyraf. They make a 'tilt' eq that you might find interesting.
Oh and a restored and racked Neumann 495 / OEv / PEv or similar from vintage disk cutting console could be awesome
Oh and a restored and racked Neumann 495 / OEv / PEv or similar from vintage disk cutting console could be awesome