I think this season will have a very fluid starting 5, depending on the opposition.
Maher, Rychart and Farley all guaranteed to start.
Holmes should be starting (remember, he is a future Boomers captain), but can start anywhere from the 3-5 spots.
Personally, I would tend to go for a starting 5 of Farkley, Maher, Holmes, Rychart and Cooper.
Cooper can run the lanes with the more athletic big guys, and has the bulk in the keyway.
If you are playing lesser mobile big men (ala Pepper, Cullen etc) start Rees to create a bit of space in the key, allowing Maher and Farley to penetrate at will.
Oscar is also a starting option, and hopefully will step up to the plate and play with potential he has been promising for the last 3 years.