4000 RP to spend

Firstly I am a new player so please dont judge me because of that... My first (and only) champion is Master Yi and i like it very much. With Master Yi on my second battle ever I scored an S- rank and received a Chest... I opened chest and got a lot of orange essence and headhunter Master Yi skin. I made skin and continue playing Master Yi and he is so good in late games, I rekt everyone on enemy team... So I bought 4000 RP and I want to buy: PROJECT Ekko or PROJECT Katarina or PROJECT Master Yi and chests and keys or chests and keys only... What do you think I should buy?
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