All the import fees make both choices quite expensive. The Hsu VTF15h mk2 does scale nicely in price/performance in comparison to JTR, at least in burst testing, meaning that two VTF15h mk2s pretty much equals one Captivator 1400 and costs nearly the same. So one thing you can do is go with two VTF15h mk2s to start with, and then if you decide you want more output, just get another pair, because that is equal to two Captivator 1400s.