Need speaker help

hi i have a bmw 325 is 1993 i am thinking on upgrading the sound system my problem its the door speakers the ones that have are oem and dount look or sound good the sound horrible and they and the grills are broke i need to upgrade them because of the terrible sound and the looks but i want a 3.5 speaker or a 4.0 speaker that come with grills and have the flush mount option so it looks as oem as posible also the twetter does some one knows wich speakers have that option i am interested in good speaker not cheap thanks