Generic NPC stats

[S'mon]

Thus, cities would try to organize elite teams of law enforcement officials - the equivalent of modern-day SWAT teams, just with magical support and trained to deal with supernatural menaces. And that's what I plan on statting up.

Sounds good - I would recommend having the elite 'grunts' at around 5th level - Fighter-5s, say - with squad leaders around 8th and maybe 10th level officers. If suitably equipped, trained & backed up with spellcasters there's little a squad of these can't handle in terms of monsters or lone high-level foes. I would avoid having teams of 15th-level Fighter guards (I've seen this in some products) unless it's an Epic-type setting.