It's hard to justify but I'd take a Titan over an Aster, and do you really need the Expert firmware or are you buying the kit so you get the adapter to use GCS? Also with a Titan you'll be able to use Maxx Model triggers.
Dump the Nuprol motor and get a 22 TPA one from @ak2m4, the one with the "fan", so much better and probably cheaper.
Personally I'd drop the Prometheus everything and go with Maple Leaf for the inner barrel and marry it with an MR bucking to get great hop (an out of the box r-hop that require very little pressure with the right bucking hardness).
Also, if they're the same price I'd drop the Gate hop unit and go with a Max Model M4A-PRO as it has so many better nub options that come with it (the hard concave nub with the MR bucking's is great).
Finally think about swapping the spring in-front of the hop unit with rubber o-rings, you get a better air seal plus less vibration, so you may then get away with an M105.