Search Radio/CD for Volvo v40

Moin moin, now I’m also one of the Volvo drivers (I’ll bring pictures and introduce my car, it’s just all wet outside). Now to my question: I have n v40 year 2001 without any special equipment, so normal speakers. Unfortunately, the car was only equipped with n cheap radio (cybercom) from the previous owner and that brings n sober sound and no bass at all. Now I want to ask what kind of thing you can recommend to me. n, but n bit of bass and good sound should come around already. Should definitely have a CD/Mp3 function, I don’t have anything against aux-in or USB-connection, but don’t have to be. Thought about spending 100€, if necessary more or less. Have no idea about it at all. Do I actually need any adapter or so to connect a radio? Have seen various kits at ebay, but want to contact you first. MfG Björn