"Smooth street shock"...?
Buy the cheapest piece of shi, shock you can find.. it will be so smooth you won't even know it's there...
Most people simply don't know that a proper performance shock is about 'refinement', 'better control' of the suspension movements. Not just harder or harsh.
A quality (either adjustable or not) performance shock is absolutely not teethjarring uncomfortable. A cheapish "performance" shock is, like those KYB's for instance.
A set or pair of Bilsteins will be a real good upgrade and just about perfect for 95% of the drivers out there.