I would like to get a new sub and make a custom box for it. Not too sure
whether sealed or ported at this type but open to comments. I'm looking for
nice control bass which is tight with clean sounds and some SPL. Currently
have the JL10WO which is pretty good but I need more now. Got around 290w
from a bridged genesis st100 to power it with.

Image Dynamics, which one?
Autobann
JL W3 series

So should I say with a 10 or go for a 12" from the above brands? Any other
brands that are resonably priced...budget USD250 or so.

Thanks people!

Jim