I'm currently thinking the Uproar for a dry lane fried up last ditch effort before breaking out the plastic kind of ball.  I generally bowl on wood, and there's usually plenty of oil, but when they fry, I have an issue getting the ball to not hook before the 30 foot line, I currently have a Totally Defiant, 2 Defiants drilled differently, a Profit, Versa-Max, and a pursuit at my disposal.  The Versa-Max has is my current last ditch effort ball, but it hooks to early when it's dry.  I'm adding a Hyper Cell to the bag, and might have a chance to add a second ball. 

Come January, I can see my 3-4-5 ball bag carrying:
Hyper Cell (Pin Up, thumb kicked out about 23-26 degrees)
Totally Defiant (Pin Up, thumb is kicked out 23 degrees)
Defiant (Pin out, Double thumb)
Uproar (Not sure, but talk with driller about drilling)
Crown

I'm not opposed to putting another brand in the bag, but so far, Roto has been pretty good off my hand.   I was suggested a Wrecker, but am afraid that'll be too much ball for the spot I want to use it.  I think the Deranged would be too much ball too.   I could go something like a Blue Hammer or Natural.   Most of all, I like the balls that go long, without TOO much early grabbing.

Based on what you now have, you might consider a RotoGrip Shout.

I typically see a heavy oil condition.  I am hoping to be in a position in the somewhat near future to be able to go play some tournaments and want to have an arsenal prepared.

Gotta agree with the other posters on a Shout. Actually the Shout and Scream make a nice 1-2 combo for dryer and shorter patterns.

You mentioned in your comments that you like balls that "push" quite a bit on there on. You would love a Deranged! I routinely get to throw this on my Thursday night condition because it naturally pushes thru the dried mids with nice smooth roll at the breakpoint.

I am impressed that none of the responses have been to use urethane =)

I am impressed that none of the responses have been to use urethane =)

Well, considering the weakest ball he has is a Versa Max, I am guessing most feel he may not need to jump that far down.

To me, it seems it is a combination of too strong of a ball/layout and not knowing/trusting where to play.  Too many people think they have to get the ball to the dry on the outside of the THS to be successful..... or maybe it is me.

I drilled up a Columbia scout  with PBA spare ball layout  this gives you a polished reactive ball weak cover with a pancake weight block this ball is at the entry level  price   

Shout is a great ball!