If you have high heat where you live do not buy Fatmat, smell is like a tar road for weeks. I switched to second skin and have had no issues with smell or sticking issues.
Check out this site, I have had great luck with buying through them.
http://www.woofersetc.com/index.cfm?fuseaction=product.brands&category_id=15&brand_ID=21
Just depending on how you want your sound quality. Your head unit can power the speakers but I would run a nice 50x4 mids/highs amp or a bit more and the quality difference would be amazing.
Orion has been around since the early 90 if not older, most of their products are produced over seas now with a decline in quality. Look into CDT you will be alot more pleased with the sound from their HD line.