Rid myself of Dakota Infinity System, install blutooth stereo?

Any experience and wisdome would be appreciated:

01 Dakota 4x4 with tape/cd infinity stereo.

So, I am looking into a bluetooth head unit and possibly dumping the entire infinity stereo system in my 01 dakota.

I have an audio input device (standard headphone jack input) that plays the Iphone or mp3 player thru my fm antenna line (auto disconnects FM antenna while music going thru) and the quality is about decent.

Generally I want more modern hands free phone action and better audio quality from my phone to my head unit.

I have been online several times and cant find decent info about options for putting a sony or pioneer in this type of car.

It appears the factory infinity system has an amp in the kick panel and the speakers are 2 ohm.

It seems the best option is to remove the factory stereo, install a good one and remove the factory amp, run the new head unit to new 4 ohm speakers.

Anyone have experience with modifying these infinity amplified stereos?

Thanks much.