A) I had a HHKB and the Grifiti fit it perfectly: 14inch x 4 x .75. After a month I returned the HHKB. I got use to the layout quickly (best of all keyboards). Problem was, they topre keys are too hard on your fingers.
B) I did not try the Glorious pad because many people complained about the edges being sloped. That is a big problem when you're on a 60% board.
C) Wrist rests will destroy your hands and arms. Until 2 months ago, I used keyboard wrist pads for the last 20 years. Major mistake. I thought I could not use keyboard without them. You're not supposed to rest your wrists. It causes big problems from your fingers and wrists, to you elbows and shoulders. Unfortunately, companies make and sell them because they know the sheep will buy them.
D) The proper way to use a keyboard is by "floating" your hands over the keys and not resting them (wrists) on anything. Yeah, I though "what the heck, how am I going to hover my hands above my keyboard for 8+ hours a day?" That sounded to me like advice for someone using their keyboard a max of 20 minutes a day.
E) Problem solved... it took me only a few days to get used to these arm supports, now I can't imagine not using them:
Check out the Amazon reviews as well...
https://www.amazon.com/ErgoRest-330-016-BK-Articulating-Support-Black/dp/B000PSUXLS/http://www.ergorest.fi/The US Government has a site that explain keyboard ergonomics, though I couldn't quickly find that link... here are a couple
http://www.healthycomputing.com/office/setup/keyboard/http://ergo.human.cornell.edu/ahtutorials/typingposture.html