Actually the Wico all-in-one 4/8 way sticks also came in grey, I know because I have 3 of them. I'm guessing the difference between the black all-in-ones and the grey all-in-ones are the black ones had both the .5" and .6" actuators in the box and grey ones only had the .5" (.5" = 4 way, .6" = 8 way).
And I completely agree on the Wico microswitch sticks, I snagged a bunch of them off ebay and they feel just like a Wico Leaf stick, and with cherry microswitches you can barely hear them. Most of mine have the black balltops but I did manage to snag a Wico microswitch with a red balltop off ebay for 6.95. I'm not positive but I checked the part number of my red microswitch stick against the internet price list that Wico has listed on their website and it shows up on there, $12.99, part number is 15-945401 for those interested in trying to acquire some.