almost any aftermarket speakers will sound better than stock...i have infinity 5x7 in front and polk 5x7 in rear,and they sound great with my clarion 45x4 head unit..i got both sets of speakers on ebay paid $30 including shipping for the infinity's,and $23 for the polks...but any name brand 5x7 or 6x8 should do the trick for you...
