I would just wait and not even get the Kickers - Just seems like a waste of money to me since you'll be replacing them in such a short period of time. (See below for alternate option

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Shit man, I was thinking of a completely different amp when I said 150. I'm sorry about the misleading information. That 1200 watt Hifonics Brutus is going to be hard to find for around 150. You might be able to find something on Ebay for around 150 - Keep looking but promise me you won't buy Lanzar, Boss, or Sony.
I'd recommend buying in sections. Get the amp over with. A pay check later, pick up the sub.
And you can find Type R's for pretty cheap... you'd be pretty happy with one i think - in a big ported box. My friend has one that flexes the ceiling of his hard top wrangler.
Like i said, get the amp over with. then maybe get the sub. then build a box. and then get a decent 4 gauge amp kit over a period of a month or so and during that time you're getting all your shit together, learn how to install a sub and amp. It's truly not too difficult of a process.
I have Crutchfield's PDF on how to take apart the dash of a 4runner. There is lots of write ups on line on how to wire the sub, etc.
ALSO:
I have a friend (so many friends!) who is in the market to sell his type R's - he'll sell you one or two and i can get you exact prices but for one shipped he's offering about 110. and for the two, 200 plus shipping. They've been rotated in and out of his car with a few other subs he has for the past 5 or 6 months. Probably less than 30 hrs of playing time on them. PM if you are interested, we can work logistics. He may be able to work you a deal since your hard for cash. Pics/videos/references (only two, but better than nothing) are all available from him.
Let me know! Again, sorry about the false amp price.