That's a very good point! I hadn't thought about that. So the consensus would be an AX3/2000 with a Rotax 582 engine as the best power unit option.
Is it a big job (in terms of time/cost) to change the engine from an HKS to a Rotax 582? I presume you need different engine mounts etc.?
Just thinking if I bought a HKS engined one (As there are a few available) and then look to change the engine afterwards..