I wouldn't recommend the HHKB for gaming, especially if you use the function keys with any regularity. At the same time, the Realforce variable weight isn't great for gaming either because the lighter actuation force of the keys on the outside can result in a greater chance of accidental key presses.
In all honesty, for your purposes, I would suggest getting the Novatouch. It doesn't feel quite the same as a Realforce or HHKB, but it's not bad by any stretch of the imagination. Plus you can easily swap the keycaps out with any Cherry MX compatible set.