What should i upgrade with dark elixir?

My BK is lvl 8.
My AQ is lvl 5.
My Golem is upgrading to lvl 3. (5 days left)

I have 70k de and 4 builders but they all busy until 4 days.

Heros always take precedence over any DE upgrades.
Personally I vote for BK over AQ because i tend to use BK as a tank.

If your Minions are maxed then go for the queen, she is crucial in just about every attacking strategy!

Bump for other suggestions.

Golems to lvl 4 you should be able to get another 10k DE in the meantime.

If you farm fast, go with the queen then golems to 4. If you can't farm that fast, save for the golem then upgrade the queen.

Upgrade your archer queen to lvl 6;)

I'd say heroes are always the preference and usually AQ is the preference HOWEVER, I'd recommend your King.

Reason: That ability boost gets stronger every 5 lvls;

your AQ needs to be upgraded 5 times, gaining a tiny bit of hp/dmg every level, whereas in 2 levels your BK will have a tiny bit of HP/dmg but also Level 2 Iron fist; and trust me, the level difference is noticeable.

I'd say upgrade Heroes in blocks of 5 if you can.

Queen since our BK is already Level 8.

I would save for level 4 golems. Having maxed troops is a big advantage in wars (if you do those).

Then heroes in blocks of 5 levels as Shintenshi says.

If you want to max your base in the shortest time possible, I suppose heroes are the way to go, since they take so long. You've got enough de for a level on both of them, so you don't even have to choose. :-)