Just ordered an All pond solutions 1400 L/H, done my homework on it too and have seen a ton of good feedback.
The only catches seem to be:
1. They tend to be a little fragile (As Them' will tell you).
2. The flow rate is nothing like the box rating.
To add to point number 2, I don't expect any filter to reach the quoted flow rate, it's something I have come to expect.
If I need to increase or decrease flow, I could make modifications to my spray bar.
Taking into account water displacement my tank volume will be much less, if I only get about 700 or 800 lph I should still be ok, providing I have nothing to impede the circulation.
Now I'm wondering how i can make this shrimp safe, anyone got any ideas?