All of this is a complete mess (gonna be hard to fully explain this).
You listed two competition subwoofers that are going to require at least 1000 dollars worth of electrical upgrades to run well (the two subs you posted are mostly found in SPL competitions where people are metering there car and trying to get the loudest setup possible, it's not exactly what I would consider a daily driver setup). These subs run on cars that have $3,000-4,000 dollars just on car audio alone (seems a TAD overkill for a daily driver soccer mom car).
You then listed a amplifier that will not do rated power and will not run at .5 ohms (not a god awful amp but it does low 2000 watts and is very power hungry/not that efficient).
You need to figure out your budget, what size subs you want, how many you want, and how loud you really want to get (also how much do you care for sound quality and how much money are you investing in your front speakers ?). You also have to factor in custom box (you don't want to buy a prefab box).
If your goal isn't doing competitions then your currently not even close to ballpark right now with selection