Well, a Boost (select the cover you're most comfortable with) is a good addition. My pearl is super long, and surprising on the back.
To replace the Theory, which if I remember correctly was a strong Assym, I would see a Dream Big. Strong solid Assym with similar numbers (2.49 0.058 0.013 for the Theory and 2.48 0.054 0.024 for the Dream Big)
As for the big oiler in your bag, I would have to say Pure. Dream Big might double as a Hyper Cell replacement without the particle in it, but for the big boy in cover strength, I would go Pure. Will be a little bit smoother downlane.
