Help picking amp for Rockford Fosgate T1D412

[Fatbacon]

I have a rockford fosgate T1D412 wired at 2 ohms ( im assuming i did it correctly since i did it exaclty like this diagram Subwoofer Wiring Wizard & Diagrams | Rockford Fosgate® where you select 1 woofer and DVC - 2x4ohm SWIFT)

Im looking to find an amp to match that sub at around $200 or less

Im also really confused about RMS and impedance. If a amp is rated at 900w at 2ohms but 550 rms what does that mean? does rms have nothing to do with ohms or is it affected too?

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