www.crutchfield.com They have a Memorial day sale going on right now too.
http://www.crutchfield.com/S-DIqU44hESDa/specials/landing/Memorial-Day.html?omnews=7158297 Even their cheapest speakers will be an improvement over stock. I went with Infinity up front and Pioneer in the back as my signature says. An amp with a stock stereo is a waste IMHO. YOu could do an entire decent system for about $250. They have alpine 5 1/4 on sale for $50 and some kicker 6x9s for $75.
http://www.crutchfield.com/S-DIqU44hESDa/App/Product/Item/Main.aspx?i=2068KS690&s=0&cc=01 http://www.crutchfield.com/S-DIqU44hESDa/App/Product/Item/Main.aspx?i=500SPS13C2&s=0&cc=01
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03 GT, STB, GM HD sway bars, 35% tint, GE893(37watt)fogs, Flowtech Terminators, 180 T-stat, ZZP DP & PCM, Ceramic PLOG & Crossover, 18" glasspack, 2007 17" Mustang Bullits 235/55/17 Pirelli PZero Nero, 12" R1 D\S rotors, gutted air box, GTP radiator