Necklaces are crucial to your gear sets. Especially after hitting your 3rd set and beyond. This is where you will prioritize your first spending when it comes to the Reputation shop as it will be the one single thing from here that is going to provide the most benefits going forward. 

Like the Garnet shop the Reputation shop has mounts to offer as well. Though more of a variety, each of them serves it's own purposes to help you out more in PvE as well as in PvP. Please be cautious before buying these and ask for help should have questions on prioritization. 

Skill awakenings are nice upgrades to the skills you are currently playing with though they are not a necessity, it is nice to pick them up in the later game to help give you a better edge on the competition or get a little more out of your build.

Unlike, the runes from the dailies adventures or the Garnet shop, these are for your accessories and can only be found here in the Reputation shop. I would try to pick these up after you have gotten other more valuable items acquire from the reputation shop. 

With Bellator finishing in the early game you may be wondering where can I get more of these skill upgrade orbs? Well right here in the Reputation shop of course! Though they do not come into the shop until lvl 600. It is nice to know we have an outlet to be able to pick these up to max out our skills going into the late game progression.