a pair of those Sundown E-12s will do VERY well in a properly designed ported box on 1200 -1500 watt rms. They are terribly under rated and a single E-12 will actually take over 1000 rms of clean (no clipping) power. Jacob (the owner of Sundown) actually has a video somewhere proving this.

Also when looking at amps you want to get something that is actually rated higher than you plan on using. You don't want to have to turn the gain all the way to get the power you need, this will induce clipping and ruin your subs (regardless of brand). If you are looking at the Hifonics line look for a BRZ1700 or higher. Also some people may disagree but the Opti series from lanzar is decent stuff as well.

As far as wiring get at least 0ga for your power and ground, as well as the Big 3. You will need to run power from the batt to the amp, then a ground from the amp to a solid CLEAN point in the trunk. checkout Sound Deadening and Car Audio Wiring by Audio Technix - #1 Dynamat Sound Deadener Replacement! for your wire. Also friends with him on Facebook and this is the only wire i use in my car.

If you will be keeping nasty stuff in your trunk for awhile consider having a box built with the subs facing up and a port facing toward one of the wheel wells, and mount your amp on floor of the trunk closest to the seats, or for that matter mount it right on the back of the seats.

If you are really on a tight budget apparently the newest Alpine Type R 8" subs do really well and will take a tad over their rated rms power, 2 8s in a properly designed and built box will blow away a lot of people that have 2 10s or 1 15. i have a friend that was competing for awhile with 2 Sundown 8s on ~1500w. When people sat in his car for a demo he offered them a $20 bill of they could guess what subs he was using.....he still hasn't lost.