It depends on whether you are going to do it or a shop. Either way, the lowering is going to be cheaper. I've done both, so I can give you what info I have. I'm not saying the parts that I used are "best", etc. but I'm just using them as an example.
Lowering:
Mach I Shocks (Tokicos): $200-shipped
H&R SuperSports: $225-shipped
Pro3i Caster/camber plates: $165-shipped
Total: about $590 for parts and add about $200 for labor if you have a shop do it.
Cams:
Comp Cams XE270AH: $520
Comp valve springs: $180
Valve cover gaskets: $30 (IIRC)
Valve spring tool: $68
AFM Cam retention tool: $29
Extra keepers

: $3
Air hose for spark plug holes (for changing springs): $7
Total: About $837 for everything if you do it yourself. If you have a shop do it, subtract the tools and hose and add about $500 (or more)for labor.