>for the amp as long as your radio has like 4x50w power it should be sufficient unless you want your driver license plat to vibrate off the holder

The alpine radio i bought is specified as MAX 4x50W, but in reality its just like pretty much every other radio with about 4x15W or something like that. Radios with stronger amps are far more expensive AFAIK. The speakers require 30 - 120W or something. So I'll definitely need an amp to get the most out of them.
I don't want speakers in the back because they look gay af through the rear window, much more work with cables, and idk what other reasons.
hifitest has rankings for different components, 4 channel amps for instance, and theres one they gave a pretty good review for upper class amps that is only 145€ new. IDK what to think of that. may be worth it?