High power is probably less important than the light gathering abilities of whatever you buy. I am guessing low light conditions are prime time for boar hunting. Also where are you hunting? Forest, scrub, open country? A low to moderate power variable would be one choice, another would be a 3x or 4x with good light gathering abilities, and practice practice practice, and you are probably good to 400 yards if you practice enough at that distance, and become comfortable doing it.
It's up in the mountains of southern Cali so I imagine it's foresty. I have a 200 yard range I can sight my scope in up by my house in Vegas but that's as far out as I can practice. Do you have any makes and model numbers you can hook me up with?
Also take a look at the MidwayUSA/Weaver Tactical Slam scope. Pretty well made, mildot reticle, 3-10x44. Midway usually has them on sale for $199-299. Great scope for the money.
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