which sub do i buy 1 or 2 ohm?

I know this is a simple question, but I'm having a hard time keeping it straight in my head: I'm looking at the Kicker CompRT 8" and I'm not sure if I need to get the 1 Ohm or 2 Ohm version. Working backwards, my amp is the RF R1200-1D. My head unit (is stock right now) will be the Kenwood KDC-X998. My truck is a 2000 Chevy Suburban 2500 LT without the Bose system and with the rear subwoofer. As a side note, I will also be installing a backup camera at the same time. OK - please help me pick - 1 or 2 Ohm!?

I just realized this was my first post - I've been lurking here for years, so I just assumed I had already posted. So . . . I just wanted to say hi and glad to start posting on this awesome board! Thank you in advance!