If it were me, I would go with this:
Venator - Can handle some oil in factory OOB. With some surface it can handle more
Long Horn - Perfect compliment to the Venator
Euphoric - Can handle med/med-long patterns - also excellent benchmark ball
Raging Bull TSE - Great compliment to the Euphoric - Also great on the busted shots
Desperado TSE - Excellent for those shorter and drier patterns.
Plastic
The only hole I see in this, is an angular ball on the lower spectrum. You could fit a Solaris Platinum in between the Euphoric and Raging Bull TSE. It would allow you to get more length and pop when you don't need the midlane. The Solaris TSE could fit in there also.
And yes, the Venator can handle some oil. It was excellent on Shark and US Open for me with factory surface. If you want just one ball for the heavies and long, than the original Raging Bull can handle that easily. This way you can keep the Venator at box surface for the med-heavy patterns.
For your THS, the Euphoric, Raging Bull TSE and Desperado TSE would suffice.
Of course, this is all relative to what your rev rate and other stats are.