I'm planning on buying an Alpine 9813 Headunit with Kicker Resolution Rs6c's up front and leaving the back 6.5's stock. For subs i'm going with 2 Adire Shivas. My questions are what amp(s) would I need to get if I wanted to run the kickers at around 100W and each shiva at around 300W? I was planning on powering the rear speakers through the HU and finding a cheap 2 channel amp to power the kickers and another seperate sub amp to power the 2 shivas but I need help on deciding which specific amps I should look into. As for budget i'm looking at around 250-300 for each amp max. The last question I have is if I want to run a sealed box for my 2 shivas what would be the appropriate dimensions? I'm definately looking for a little more SQ than SPL in a set up. My car is a hatchback so trunk space is pretty ample for a car its size which leads me to believe there's enough space for the larger sized box that shivas require. Thanks for all your help in advance.