In regards to the HHKB vs. 103U or 87U, I do like idea of all 45g weighting on the HHKB Pro, but honestly, as I am typing this on my Realforce 103U, I do not notice the different weighting of the keys. Odd, but true. I'd still prefer them all to be 45 (but not 55), but the differential weighting is a very minor thing, and who knows? Maybe I'd even prefer the 35/45/55 setup that I have if I were able to compare side by side. The pinkie finger is, after all, a lot weaker than the others!
I keep trying to convince myself to buy an HHKB Pro 2, but no matter how I try, I keep coming back to the same things: the layout just isn't for me, mostly in that some of the keys I'd need to use frequently would require two hands, and that is a deal breaker. I know about the dip switches and all that, but even so, there are certain keys, either on mac or PC, that I really want to have, that I would need to use combo key strokes for on the HHKB. I do love the look of the thing, though, and I like the minimalist approach, and I may some day have to buy one just to be absolutely sure that I wouldn't get used to it and love it, but right now, I suspect that the 87U is the next best bet for me.