Okay, here is my thoughts on the current ones:
Optimus Prime: Not the best version compared to FE, but does look better than the other Voyager mold.
Bumblebee: Not in scale with Prime, but he is w/ Arcee (from any movie and Prime), EP Jack, Raf and Miko, Deluxe Revenge Ravage, Deluxe Darkside Moon Laserbeak, that other shelfwarming, bulk-bringing BB and maybe MP-01/04 Optimus Prime and MP-05 Megatron.
The upcoming ones:
Optimus Prime: Hopefully, Takara won't make him have much bulk.
Bumblebee: Maybe like the BH Deluxe?
Ultra Magnus: GIMME! He would DEFINETLY deal with look nice w/ his brother, Prime.
And ones I would love to meet are Megatron, Dreadwing/Skyquake and the upcoming, Predaking.