May I assume that you are ordering the LP mask from Absolute?
As far as jackets go, I have personally used the BG C/N jacket, the BG heavy stretch jacket (100% Nylon) and the BG 350NW Stretch Jacket with European fitting (made from "Terylene"), and I've seen the AF blue-trimmed jacket (didn't get close enough to read the tag, but it looks like it's also made from Terylene, or something similar).
As for what's on the list provided:
The BG Nylon jacket is noticeably stretchier, lighter in terms of weight, and the fabric is noticeably thinner (as a result, the Nylon jacket retains less heat) than the BG Terylene jacket. The Terylene jacket, on the other hand, is slightly better padded (due to the fabric being thicker; I find that the impact of a touch is slightly dampened, up to a point), and has a somewhat slicker (compared to the Nylon) texture. The cut/fitting on each is also noticeably different (both of mine are size 44, but they fit me completely differently); the Terylene jacket is slightly shorter and narrower in the arms (leading to less bunching in the sleeves, which in turn makes arm hits more difficult for one's opponents), and the collar is a bit narrower (not uncomfortably so, but it's noticeable). Finally, if BG advertising is to be believed

, the Terylene jacket is (implied to be) a bit more resilient than the Nylon jacket (510 Newtons vs 350(?) Newtons)
Of those two, I would probably recommend the Terylene (Euro-fitting) jacket over the Nylon (heavy-stretch) jacket. My guess is that the "functional lining" is otherwise identical to the Terylene, so it's up to you whether the additional lining is worth the extra cost.
As for BG Euro-fit vs. AF blue-trim, I'm limited to conjecture. If they're made of the same (or similar) material, they should have the same (or similar) properties, in terms of stretch, weight, and durability. the cut/fitting between the two is likely different, but I do not know how. As far as "showing off for the ladies" goes, I suspect that the blue trim (assuming it doesn't fade or discolor the rest of the jacket when washed) would probably give it an edge over the plain BG jacket (especially when paired with the matching blue-trimmed knickers...).
I have no experience with PostSport/The Fencing Post, so I can't comment on that jacket.
I suspect that you may be more satisfied with the blue-trim jacket (if it is indeed made from Terylene, or something similar), especially if you
are also ordering the mask from Absolute (since everything should ship together in a single package from a single, which should reduce shipping costs and allow everything to arrive together).