Audio Update Question

[demirev]

Hi all, I have a 2008 Yaris Hatchback.

I recently upgraded the stock speakers to four new Arc Audio Xdi 602 speakers. (60w RMS power handling, 86dB sensitivity). Everything else is left stock for now and there's no amplifier.

I'm a person who values the clarity of music more than loudness. I need some feedback on which upgrade would be the greater marginal improvement to audio quality - an amplifier, or a new head unit?

I'm currently looking at head units like this and this and this and this with 22 RMS output but I'm also drawn to some head units which output less; this one with 14 RMS looks beautiful and has outstanding reviews, plus I'm drawn to HD Radio.

I haven't looked at any amplifiers because I'm afraid of the amount of wiring I'll have to do to set it up (I had the speakers installed for me but I think whatever I choose now I'll do myself); I also don't know anything about amplifiers or which price range to look in/how to find a good one.

Would you guys recommend keeping the stock head unit and purchasing an amplifier or getting a new head unit?

If the answer is a new head unit, could someone recommend one? I'd need a head unit that looks nice and clean, bluetooth is a huge reason I'd be upgrading, and HD radio would be nice.

Thanks!