Another vote for 40:1 w/Redline oil. Everything I own gets that.
Mikey, if you need a mixing cup, go to your local motorcycle or cart shop and pick up a Ratio Rite.
Ratio Right, Ratio Rite Measuring Cup Home Check it out. They're about $6 on EBay, a bit more at a local shop.
You can't go wrong with these. No math to it. You pick your "gallon" amount at the top of the cup, add the appropriate amount of oil to the ratio line underneath said "gallon" amount, pour that in your gas can (recommend oil in first before gas, as when you add gas it will mix it very well), and just buy the exact amount of gas (I don't count on that I can stop the machine exactly).. done and done.