Apple for car cassette for iphone?

So i have a question
I have a cassette player for my i phone in my car
It makes a lot of hissing sounds when you put in the cassette and when your playing a music
and the sound quality is bad
What I really want to do is, put it in my i phone that way when someone calls I can hear the person in my speakers
But with the cassette player I have now, it makes tic-kicking noises and the person who I'm talking to is hearing themselves echo.
So i'm thinking of buying an apple car cassette for iphone so its meant for apple i phones
Will that solve my problem? Ill buy the best one also? Amazon

Buy a new car stereo with iPhone control. Examples below:

http://www.crutchfield.com/shopsearch/car_stereo_head_unit.html?showAll=N&nvpair=FFCategory%7c%5brank266150%5dCar+Stereos+%26+Components&nvpair=FFSubcategory%7c%5brank300%5dCar+Receivers&nvpair=AG_iPod_control%7cFFiPhone_4S_Compatible