Hello,
While a bit larger than your current pump, the Red Dragon 3 - 150w pump would be a great choice, and is fully adjustable to tune the flow to where your system is optimized.
The pump also has 0-10v inputs, with cables available for both GHL and Neptune pinouts.
http://royalexclusiv.com/Flow-Pumps/...tion::857.html
The RD3 pumps, especially the big block versions (150w/230w) are some if not the most reliable DC pump on the market, in both the flow and price category.
Please don't hesitate to reach out for further questions.
-Marco