end game!!!!

[Firepower]

I would assume the quickest path to the highest gear level would be to aim to get to the new 24 man content in 2.5 next week. This would require completing the first 2 crystal tower instances whilst trying to gear yourself up. I'd recommend as mentioned above go for getting your relic zenith first as it is simple quick easy and will give you a decent item level 90 weapon.

You should be able to get into the labyrinth of the ancients at item level 50 so you should get in right away. By the time you have done that and the zenith relic you should have a few pieces of soldiery gear (bonus for first time completions on all the trials and labyrinth of the ancients will get you a lot of soldiery) You should be over item level 70 at that point and aim to complete syrcus tower once that is done I would estimate grinding out a few more pieces of soldiery perhaps get a few sand and oil from syrcus tower too and upgrade them to i110. I would estimate that in 2.5 the entry into the final phase of crystal tower will be at least item level 90.

Once you can go into the new content next week you should be able to pick up a new i120 piece a week plus upgrade any poetic tomestone piece you may have gotten to i130. After that it's just cap your weekly poetics and pick up a new piece of gear and upgrade item from the new crystal tower raid every week.

I would assume that is the path of least resistance because in syrcus tower you are unlikely to be noticed or ridiculed for being "lesser geared" as with 24 people your solo effort holds less weight on the total outcome of the entire raid.

Technically the quickest way of gearing up would be to run bahamuts coil turn 1-5 then once fully geared try and do 6-9. In theory you could gear up very quickly that way but as a new 50 that would require a lot of work and is extremely likely to come across a lot of annoyed people who don't enjoy newcomers.