If you want a direct replacement, you're going to need the same engine. Swapping in something else, be it some NA 2.0 or a US 2.5, would involve a lot of tweaking and sensor swapping, which can be a headache. $795 isn't that expensive. Places like CCR, who have been doing rebuilds for longer than pretty much anyone, are more expensive, but have actual warranties:
They would also be able to give you some more detailed info on which engines would drop in, with little to no fuss.