I tend to go for things on the other side of the board, say from the right of 5, t, g, v and any of the F1-12 keys.
If you leave the modifier off (bind the Gkey to a single key, not something like alt+key unless you REALLY want to) it makes it less likely to stuff up.

Heres an example.

You bind G1 to press "Alt+0"
You're in combat! Oh crap need to heal, but you also want your toons to do damage. You mash 1 while pressing your G1 key.
Your keyboard sends the signal that you are pressing alt, 1 and 0. So if you pressed G1 and 1 at the same time then if you have anything bound to alt+1 then it's going to be triggered, as will alt+0.

Hope that makes sense.