The GHQ line is amazing, a shot of Krylon OD spray paint and they should suit your purpose (if they are not too small).
For Iltis/Leopards & ARV's just look under Modern/German. Coyote can be LAV-25 (Modern/US).
Notice that they have even pictured the Leopard with a Maple Leaf on it (you can order the Maple Leaf decals from GHQ as well):
For the LAV3 you can be either lazy (either use a LAV-25) or creative (use a GHQ LAV-25 turret and a GHQ M1126 Stryker IFV chassis).
GHQ doesn't yet make a "Canada" line-up unfortunately.
Bison can be made from the GHQ LAV LOG+C2 pack:
C in C does have Canadian vehicle's and makes some of the more rare items like Cougar, Grizzly, Husky should you be interested.
No one currently makes a G-Wagon equivilent that I can find.
They even make a "Mujahadin/ al Qaeda Combat Team" ...
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Just be warned, these things are not totally durable. The barrels on the LAV-25 are extremely fragile (thin pewter) but I don't think your trying to win a "modeling contest".
Even more entertaining is the natural tendency for grown men to grab the tiny Leopard and start making "silly engine noises" while moving them around a map... ;D
Cheers