What can you buy with Dilithium that I dont have listed here if osmeone could help me out
1. Ship Items that u can craft but for straight Dilithium up to M XI
2. The common and uncommon crafting mats for items up to M XI
3. Green Duty officers from Star Fleet Academy
5. Other ships that don't require C-Points.
Is there anything else say maybe blue or purple duty officers?
Blue and purple doffs also from the academy. Each tier in each category gives a free token (green for tier 1 and 2, blue for 3, purple for 4) after which you can buy the rest of the doffs in that tier for dilithium. You also need to pay a small dilithium "fee" when you use the reassignment contacts to trade 5 doffs of one quality for one of the next quality up.
There's also consumable transwarps basically like the permanent one the Excelsior retrofit has in the dilithium store. At 32k for 10 I haven't touched them, though.
Edit: Several of the shipboard doff contacts also let you create most consumables for a few dilithium.