if you are dead set on a 10" sub i would recommend this:
https://www.woofersetc.com/p-5806-id...subwoofer.aspx
if you wanted to run an 8" (all the car needs IMO) at 300 watts i would recommend one of 2 subs:
first most expensive but definitely the best 8" i've ever heard:
https://www.woofersetc.com/p-4314-21...subwoofer.aspx
or:
https://www.woofersetc.com/p-8129-mm...subwoofer.aspx a really decent sub for SQ.
all 3 subs would work well with the JBL amp (you'll have headroom with both 8s) that has been brought up. all 3 of these subs like sealed enclosures .7cu/ft for the 10" and .35ish cu/ft for both of the 8s.
i really could not pick a better amp for the money but, i also would consider:
https://www.woofersetc.com/p-7247-ks...amplifier.aspx arc makes great stuff that will be very clean. 310w/rms @ 4 ohms