I recently changed out the speakers in my 2010 TRX4... I went with Boston Acoustics S35 in the dash and S65RC in the 4 doors. The sound is amazing compared to the stock speakers. I Just ordered a JL Audio 10" sub 10WX-4 and JL Audio mono amp J2 250.01. If you go with these speakers you will need to add a sub and amp. I found a website that sells car stereo products about 40% less then crutchfield. Follow the link. The install was easy and was completed in about 2 hrs. for all 6 speakers.
Ross
http://www.sonicelectronix.com/