Hey everyone

Don't know anything about car audio but I want a system that will produce a beautiful crisp sound (no budget)
Not going for anything obnoxious or over the top - just wanted opinions on best quality products & box placement etc.
Im looking for whatever combination of subs/amps is best for my truck. I want to replace my OEM speakers, too.
05 Nissan Titan King cab (ext)
Do I go subs under driver & passenger seat? Or under bench in the back?
One 12"? Two 8"? I listen to mainly hip-hop with simple deep bass lines
Ty for any & all help!