Astrum Hose is #1 purchase.

For your next purchase:
If you're working on T6+ and you have Allagan Boots of Maiming (T5), purchase Weathered Gloam Ring.
If you're working on T6+ and you do not have Allagan Boots of Maiming (T5), purchase Weathered Astrum Sabatons.

If you've not killed T5 yet/working on it for whatever reason, get Weathered Gloam Ring.

But, you're still running with i70 accessories. Upgrade them to i90 through Coil Farming, or upgrade them through Soldiery, AFTER Astrum Hose.