Good 4 Channel Amp + front and rear speakers

[iNF3RN0]

Hi,

I am looking for a 4 channel amp and front components + rear coaxial speakers. Anyone have got any recommendation? and from where I can get used / refurbished good brands amps like Alpine etc

 

[Cerberus]

i suggest you pakwheels car audio forums. there are lot of alpine units for sale
which co-axial you need 6x9 or other size ?
especially your budget