I have infinity reference series in my alero and it is crystal clear... i love them... they are also hooked up to amps not just off the deck so it improves their sound as well... for the head unit and wiring just get a bracket harness and antena adapter and take your time... easy as pie 
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Misty: 3400, S&S headers, TCE 65mm TB, CAI, 180* TStat, Milzy motor & tranny mount, 18" BOSS 328 & much more... going osv!!
Silver: 2.4L, 5 speed, GAGT seats, front & rear STB's, all red tails, led headlights, Magnaflow muffler, Milzy Motor mount, WAI, Cosmo short shifter; sold n missed  
Tequila: 2.4L, GA interior swap, scrapped...
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