RE: Drake fins, cheap but not chearful
it's quite obvious. You can use the Curtis type fins that came with the '04 HS on other boards with some success; while those supplied with the '03 model are useless on different boards. The HS seemed to me to be very little fin sensitive but other boards, and expecially slalom boards, are different.
So in the end my answer is obvious. If and when you feel you need to change, change. Otherwise use the supplied ('04) fins. They will work on the HS, and they can also work on other boards. If you'll decide to change, I can not suggest anything for the HS as I don't have experience with the HS and other fins. For different boards, I am happy with the Deboichets I use on my S95 and they are worth their cost.
if price difference is really small I agree with you that it's reasonable to supply the boards with useable fins. But it would be better to supply them with suitable ones. I am not convinced that even a good slalom fin has to cost much more than an cheap one. And by sure if I have to evaluate based on the public list prices of the Drake Pro fins, then it would be much much much better to sell the iSonics with an equivalent discount.