I think the Eruption Pro Orange or Eruption Pro Hybrid are good choices for medium oil for bowlers with matched speed/revs. Considering that Ratt has higher ball speed and a lower rev rate, I would suggest something stronger for medium oil. If you're *really* high speed, I would go with a Disorder, as that will get into a roll almost as soon as the Melt Down. If you're just a bit speed dominant, I would go for a Throw Down, Smack Down, or Take Down. Smack Down was just discontinued and is a hybrid of the Throw/Take, so that might be the most logical choice price wise.