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My local store is holding a 500 point kill team style tournament and I'm not sure what to use, I was thinking

10 man tactical marine squad with 2 plasma cannons

10 man tactical marine squad with 2 heavy bolters

Ravenwing attack squadron, 5 bikers, 2 plasma guns

I'm wondering if I should scrap this or change some things, for example the attack squadron for 3 black knights

What does everyone think the best list for this is?

Unless the tournament is changing the rules on it, you can only take one heavy weapon in a tactical squad.
Is the FOC limited in the same way as KT? 2 Troops, 1 FA, 1 Elite? Are the models operating individually or in units? Access to specialists / leader rules?

500 points for a kill team match would take forever...

Back on topic, I'd suggest using the black knights, they are one of the most competitive things in the codex.
Failing this, then just stick with using tac squads tbh. C:SM will create more powerful lists by virtue of their chapter tactics, but I'd say this is the next best thing DA have after black knights for kill teams.

Stay away from normal ravenwing bikers and terminators, you will be easily outclassed by other armies.