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Both the roll for Wraithsight and Psychic tests are supposed to be made at the start of the turn. Does it matter which is done first? I can imagine a scenario where I roll a 1 for Wraithsight, causing me to go somewhere else with my Psychic power.

Gamewise both rolls would be considered to be simultaneous regardless of which was actually rolled first.

Nothing states which to roll first. Usually if something happens at the same time as something else you can choose which to roll first, however because they technically happen at the same time if one ability is useful for the other or gives it bonuses they don't apply no matter which was rolled first. An example is DSing something with a teleport homer would not allow you to use said homer for other DSing units that turn.

I would roll for wraith sight first because of the reason you gave, however I've never ever rolled for wraith sight.

Likewise.
If I'm going to be casting anything on a unit with the wraithsight rule, I've generally got the psyker close enough to not need to make the checks (wraithguard have a warlock, Wraithlord has the farseer following in a unit).

Actually if you (being Eldar) can cast one of your psychic powers on a wraithsight affected unit, then your in range for it to not be affected by wraithsight.

Fortune & Guide(the only friendly usable PAs) only affect units that are in 6" of the psyker.

Wraithsight test is taken when there are no psykers within 6"

Ergo you will NEVER have this problem.

AchillesFTW wrote:Actually if you (being Eldar) can cast one of your psychic powers on a wraithsight affected unit, then your in range for it to not be affected by wraithsight.

Fortune & Guide(the only friendly usable PAs) only affect units that are in 6" of the psyker.

Wraithsight test is taken when there are no psykers within 6"

Ergo you will NEVER have this problem.

There's plenty of 12"-18" range powers. Also you turn may be planned out differently if you have the use of your wraiths as opposed to not having them. It can and will change your strategy

Sothas wrote:
There's plenty of 12"-18" range powers. Also you turn may be planned out differently if you have the use of your wraiths as opposed to not having them. It can and will change your strategy

Not ones that can enhance your units. Guide + Fortune are range 6". All other psychic powers for Eldar are either Shooting attacks, or ones that target enemy units.

liam0404 wrote:

Sothas wrote:There's plenty of 12"-18" range powers.

Not ones that can enhance your units.

The OP never mentioned powers that target his units or the enemy, just powers. Having the wraith units incapacitated might still change your casting priorities.