My wager is that Phoebus is the clear favorite to win the title this year and that there are 4-ish other teams that aren't on Phoebus's level but are a cut above the rest, and could give them a game on the right day. Those four would be Dinwiddie, Huguenot, Varina, and Salem. From what I've seen, Salem's fans have been a bit underwhelmed by this year's edition of the Spartans, but I've heard that kind of talk from them before and it always feels like they're a threat to win the championship regardless.
Sherando, Handley, the NOVA teams, and a few of the southern teams I know less and little about would probably fit into the group just below those four. I could move a couple of them up if they continue to impress, but at present I'd say the 6-15 range are pretty closely matched.