Re: What brand of slugs?
it depends on your gun setup. If you have a smoothbore barrel, then you want rifled slugs - always cheaper. If you have a rifled barrel, you don't want to shoot rifled slugs, but sabots-- more expensive. Within 100 yards, the deer won't tell the difference. The sabots and rifled barrels allow the 'reach out and touch' effect, 200 yards is definitely not unreal these days.
That said, like 4clabs, I have a mossberg 20 that loves SST's, and it's dynomite on deer.