Depending on the situation, I'd usually go with about 3000ft for normal climbers.
There are, as others stated above, a lot of factors in play. But we never do things to annoy the pilots, and if pilots want to talk about odd practices, just give a call 😉
And for the go around, just a roger untill they've gotten some altitude as well (but I've got to talk to them at some point, since the missed approach where I currently work ends up opposite the inbound traffic)