yah, i got a pioneer double-din for its eq. it's got many bands and very controllable.
while it's not the greatest sounding audio, my Z is pretty loud already with its exhaust so the stock speaker is okay for now.
i dont feel like adding subs and amps to weigh down the car either.
if one's looking for a decent non-nav HU, definitely check out the pioneer 4400BH. very good reviews.