I finally grabbed a Grand Max last year. It is sort of the 'holy grail' of my G1 collection so it is a mission accomplished for me...
I also collect Grimlocks and would like to have every Grimlocks that have been released. So far:
G1 Grimlock
Pretender Grimlock
Actionmaster Grimlock
G2 Grimlock (2 out of 3 color variations; missing the turquoise one)
Beast Wars Grimlock (i.e. repaint of Dinobot)
Energon Grimlock with Swoop box set Grimlock
JustiToys WST Grimlock
JustiToys WST Comic Version Boxed Set Grimlock
Alternators Grimlock
Binaltech Grimlock
Titanium series 3-inch Grimlock
Titanium 6-inch War Within Grimlock
Classics Grimlock
Henkei Grimlock
MP-08 Grimlock
US Masterpiece Grimlock
Animated Yoyager Grimlock
Animated Activator Grimlock
Animated Activator Goldfire Grimlock
Still a few holes to plug before I can say mission accomplished but I'm getting there