ive been doing research on this as well.
ive read that the 3 way (and definitely 4 way) speakers are not necessarily better than a 2 way (coaxial) speaker. it draws more power to push all the speakers, and with our limited power from the factory amps that wouldnt be good.
the kenwood kfc-c6893ps are very cheap and are designed to fit in fords. some people like those.
other people like polk audio stuff (it used to be the **** back in the day) but they are more pricey, but not really any better anymore from what people say.
check out millionbuy.com. they have prices that u would get buying something that 'fell off the back of a truck'. its seriously ridiculous how cheap some stuff on that site it. so check there first, but then also amazon has good deals.
personally i plan to buy the infinity 6832cf's because they are very sensitive (good for low power amps, like ours) and infinity is known for their crisp highs. i plan to put my subs in the trunk soon though, so thats where i'll get my lows
its tough to decide how something will sound in our cars based on something someone says online. the bottom line though is that EVERYTHING will sound better than the stock speakers
2011 Mustang V6 Premium 6MT. Kona Blue w/ White Lemans Stripes. JLT CAI, BBK long tubes, O/R X-pipe, Cat-Back Borla ATAK, MPT 93 Performance Tune, SR Performance springs, J&M Adj Panhard Bar, J&M LCA, UPR Adj UCA, One Piece Aluminum Driveshaft