Connor,
The Polk subs referenced are definitely entry-level, but very good as compared to typical entry-level products. The Alpine sub is a clear upgrade. Keep this in mind. Subwoofer surface area is more effective in creating acoustic output than more amplifier power or more subwoofer excursion. So in terms of pure output, two 12" subs hold the advantage over a single 12" sub. Subwoofer power handling ratings do not necessarily correspond to higher output levels.
I'm not entirely comfortable with many amplifiers running into a 1-ohm load even though they may be rated for 1-ohm operation.
IMO, it's not an automatic upgrade. Maybe you can keep searching for another approach. I would start with the maximum enclosure size that you can tolerate.
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