I just did a set of Morel Maximos in my GTP. They are typical Morel in sound, laid back on the high end with a really smooth mid range. What was suprising was the amount of midbass they produce. So much so, that i was able to lower the x-over frequency of my subs which helped shift my soundstage up front.
Unfortunatly the price has gone since I purchased, but I would buy a set at the current price. They are that good.
Amazon.com: Morel Maximo 5.25-Inch Component Speaker System: Automotive