Looking for a relatively inexpensive replacement, fork

Currently have leaking rebound dampener and no replacement available. The knob got hit hard and damaged the inner plastic adjuster.

What I have
26 inch Manitou Nixon Comp 145mm travel
1 1/8 straight steerer
510 mm / 20 inch atc measurement

Looking for a replacement fork with about the same atc spec that is decent and less that $350.

Thanks