How much do you want to spend? Rotella T6 5W-40 is very popular for cycles. I've used it in many cycles for years. Cost is about $22 per gal. It's a Group III (hydracracked - lowest level) synthetic.
Next step up is a cycle-specific synthetic oil like Mobil 1 4T 10W-40 or Castrol RS 4T 10W-40. Those are about $10 per quart. Higher level Group IV PAO synthetic. I believe Redline oil is in this category as well.
Next step is a Euro oil like Motul or Repsol. Their top of the line racing oil (like Motul 300V) is about $15 to $18 (list) per quart. Highest level Group V Ester based synthetic.
I use Rotella T6 a lot, but have Castrol 4T 10W-40 in my SV right now. Motul 300V claims to give you the most power, and I've seen some info that suggests it does.
Can you tell the difference on the street? Probably not.