I think that the Shift is really meant for medium oil too, so that would be a waste. There are mixed reviews on the Paradigm Passion, so for heavy oil, I would go for the Double Agent. A step down from that is the solid version; the Special Agent.
If you don't encounter dry lanes very much, then I wouldn't bother buying a ball for light oil. I don't encounter light oil at all really, so my arsenal lays out like this:
Heavy oil ball - Strong arc reaction
Medium/heavy oil ball - Flip reaction
Medium oil ball - Strong arc reaction.
Spare
Still, the Tropical is a good choice for dry lanes if you get them a lot. If you don't feel you need a medium-to-heavy oil ball, then just carry three in a roller. It weighs less than a four-ball roller, and you can always strap on a Joey if you want to put on another ball. Plus, 3-ball rollers are cheaper than 4-ball rollers.
Does this help you any?
Edited on 4/29/2007 6:52 PM