Don't need to pay attention to the peak watts, it's all about the RMS(Continuous) wattage for both Sub and Amp.
Your talking about this one, correct? So it's already in the enclosure?
If that's true, that's easier no need to know how to wire the sub, just the amp. You want an amp that would output between 150 - 180(max) RMS watts @ 2 ohms(Since your sub is 2 ohms). Don't go over 180 watts cause you could blow the sub and that would suck.
Here is a diagram for mono amp(strictly for subs):
Here is a diagram for 2 channel amp
These are normally cheaper than a Mono amp.) And you would bridge the (2) channels to become a Mono amp @ 2 ohm.
Either setup would work, it's based on your budget and if you can find that matching wattage and ohm rating.
In the car audio world what you pay for, is what you get. Since you opted for a Polk sub, I would stay away from Lightning Audio, Jensen, Boss and brands like that. (Just my opinion.)
And you'll need an Amp kit to install the amp(As an amp needs to be directly wired to the car battery.). A 10 gauge kit, isn't expensive and would work for your setup since the wattage isn't that high.
Some sites to look at: