new sub help

I just got a WRX wagon and realized I didn’t want to take up as much space with the sub box that I did with the integra. right now I have 2 12" polk GNX series with a profile 300w rms mono amp in a sealed box, I love the sound of it. What I am looking for is 1 or maybe 2 10”, but I would really like just 1 if possible, that would fit in a small box and sound as good as the cheap 12s. I don’t care if its really loud just a good smooth sound with lots of punch.

Youd probably like an Infinity Kappa Perfect 10.1 with a 400-500 watt amp. I think that would sound fairly nice for what youre looking at.