Maintenance for the week of September 30:
• [COMPLETE] Xbox: NA and EU megaservers for patch maintenance – October 2, 6:00AM EDT (10:00 UTC) - 12:00PM EDT (16:00 UTC)
• [COMPLETE] PlayStation®: NA and EU megaservers for patch maintenance – October 2, 6:00AM EDT (10:00 UTC) - 12:00PM EDT (16:00 UTC)
Bank space. Inventory space. Horse storage and/or speed.
Other than that, there is nothing that you really need to save up for until close to end-game, when you might have to purchase some items that you want for your build.