I've read mixed reviews on the Jebao's. From what I understand, they are really efficient, but not so reliable.
Pumps are the heart of your tank, so I would be careful to not be penny-wise and pound-foolish.
I personally think the 10x turnover rule is overkill and if I were to be blunt about it, it's total nonsense.
I run about 2.5x on my 770G and although I don't keep huge fish, I wouldn't say that I'm lightly stocked and I've never had any measureable ammonia or nitrite readings.
The larger the tank, the less turnover you will typically need. Look at some of he huge public aquariums, and they have like 1 turnover PER DAY. I can guarantee you that they are not running 63 million GPH on the 6.3 million gallon Ocean Voyager Aquarium in Atlanta...and they are keeping whale sharks.
If the budget for your pumps is tight, I would suggest running two Max Flo 2400. They will get you around 5x turnover, which is plenty. If your water parameters are bad with that type of flow, you either don't have enough bio-media, you need to do more frequent water changes or you are overstocked. All the flow in the world won't help if you are trying to keep too high of a bio-load in a tank...water changes are the only thing that will solve for that problem. And if you decide you still want more flow you could always add an additional pump when the funds are available.
I know people will disagree, but those are my 2 cents.