This happened quite a while back, but I'll give an update: went for the infinity speakers and installed in back. They sound great, but could definitly use a bit more umph to push the sound through them. Actually, when my phone is hooked to aux, it's plenty loud enough stock. Just the radio/cd player are too quiet.
Only other issue I have with them is the bass is definitely weaker than the OE speakers, by a significant amount. A small sub or different model speakers to pair with them would help tremendously. I just set the fade to 60-70% rear and that seems to work alright.
The bracket crutchfield includes is almost useless, as are the screws and clips that go with it, due to the shape of the door around the speaker hole. I managed to make it work, but I'll probably end up getting someone to make a custom bracket if I keep the car long enough.
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View my fuel log 2017 Mirage ES 1.2 automatic: 42.3 mpg (US) ... 18.0 km/L ... 5.6 L/100 km ... 50.8 mpg (Imp)