Ender IO experience obelisk is good choice it what I used in 1.10.2.
Seconded - this works VERY effectively for storing personal XP; in addition, EnderIO adds its own liquid XP which can be created and stored by using an XP vacuum connected to a tank; that can then also be pumped into the obelisk if memory serves. You will need to initialise the XP vacuum with a small amount of liquid xp first - you can do this by basically doing the process above in reverse temporarily:
Put a little personal XP into the obelisk (really easy, via its GUI), pump that out of the obelisk into a tank set to output into the xp vacuum - this will initialise the XP Vacuum block; then reverse the system once the vacuum is turned "on" (i.e. tank set to input, and pipe into the obelisk).