The phrase 'Enough already!' is forcing the speech in a way that is best translated by only 1 word in Bulgarian:
Достатъчно! (used for the more formal occasions)
or
Стига! (informal)
If you want in your translation to implicate the force this phrase has in American English, you'd better not include other words in your Bulgarian translation, being they вече, толкова, or any other - if you do that, you'd only decrease the enforcing sounding of the phrase in Bulgarian.
Here I've prepared a small

Comparative Table of the levels of enforcement involved in this phrase, where the most common English and Bulgarian translation variations are covered:

Highest level of enforcement:
Enough already! - Достатъчно! (formal)/ Стига! (informal)

Lower level of enforcement:
Enough! - Стига вече! / Стига толкова! / Престани! (informal only)

One have to know that while in the American English 'already' in this phrase increases the force involved, in Bulgarian language the strongest force is implied by one word only - the main imperative "Стига!" / "Достатъчно!", without any additional words .