Some will disagree, but for the moment, you got it. I sell blue and purple 28s by the truck load
If you want to upgrade your 28/66 gear check out Dulfy's level 55 endgame gearing guide
where to go.
My advice gear your character up first then take advantage of any extra/leftover gear and RE the mods.
With history of what gets converted to craftable , the assumption is that grade 34/78 (from HM DF/DP and Ultimate Comms) will become craftable once NiM of the latest Operations (DF and DP) hit...mid-March at the earliest (Full/Official release of GSF hits in early February).