damn GON is overwhelming me more lol! The HHKB, to me, doesn't look good at all but am willing to get it if I find nothing that compels me to buy something else. Still trying to see other's opinion on other keyboards.
GON is simply one of many Korean custom keyboards, which are widely regarded as the "best" keyboards because of their build quality, design, and customiziblity.
I recommend you go with the GON rather than the Poker - with the Poker, good quality casses (FMJ, Hammer, other nice aluminum cases) are harder to find (only available through classifieds I think), and most other mods are rather involved and time consuming (switch and plate swaps/modifications).
Pick something from here
http://www.gonskeyboardworks.com/3-custom-kbds-w-assemblyItems with "NerD" in the name have newer PCB's.
If you can find other Korean customs for sale in classifieds (I know there are a few), or just aluminum keyboards, check those out too.
HHKB is more of a status symbol imo. It's a full plastic keyboard that costs about 250 with no customizibility, backlighting, etc.