97 jeep cherokee, system, ideas?

Ok got my box built and I have 1.8 inside volume. Now I listen to mostly metal,rock,pop music. Not interested in compitions or any thing. I have (2 12" kicker seperates) or (2 10" rockford fosgate XLC) I have about 250 watts to run to them. which should I go with. I know, get better speakers. Love to but this is what I have. the box is in a 97 jeep cherokee in the back facing backwards. Looks kinda like a std cab truck box. Any helpful input would be great!

How durable are the Hifonics amps?

I have had very few problems with them in a real world application, but the HIfonics 4 channel that we use to run our demo room (I work for fry's and have no choice.) has been replaced once, and the new one has lost the ability to adjust the crossover after 3 months of being on 24hours a day in a confined area...