Solid stuff, HSK165's should do about right. Like anything car audio 90% of the time you get what you pay for, so bottom of the line Hertz or Focals aren't going to be much better than a set of Kicker's or Pioneer's for the same price, but get the right stuff and you will be more than happy.
Gare has Hertz in his truck, and can give you some good ideas on them.