Buy a 40 gallon breeder, you can get them on sale for $40 at petco, or use one for about the same.
Get some glass cut up and put the baffles in yourself. Buy some sock holders.
All less then $100 and much better then what your looking at.
That sump is very high, the 40 gallon breeder has the perfect size for a sump.
I design my sump differently from most, I am willing to share my design if your interested.