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This is the edition I'd recommend to buy. Well, if you have a Kindle. (It's only like $6 for Kindle.) I hate Signet editions in paper - they're cheap - but the advantage to this one is it's one of the few collections of all the major plays in one volume, and Roche's translation is...it's okay.

The collection contains:
Hippolytos (five stars; no distinct review)
Medea (five stars)
Trojan Women (four)
Alcestis (four)
The Bacchae (four)
Iphigenia at Taurus (four)
Cyclops (three)
Ion
Electra
Iphigenia at Aulis (five)

Personal note: leave Hekabe for when Anne Carson's Grief Lessons get released for Kindle in August. Elektra or Orestes is next.

Other Euripides Plays
Heracleidae
Andromache
Hecuba
The Suppliants (Suppliant Women)
Herakles
Helen
Phoenician Women
Orestes
Rhesus

You may also be interested in: my opinions about the best of the ancient Greek plays from Aeschylus, Sophocles, Euripides and Aristophanes.