which 6300IP champion should i buy?

I have 3300rp enough for 3 6300ip champions, so who shall i buy? The only 6300ip champs I have are yasuo, vi and nami, braum, aatrox, ekko, tahM kench, darius, gnar, hecarim, fiora, jayce, rengar, vel'koz, thresh I main top and jungle but i play all roles I was thinking to buy zed, diana and rek'sai but i wuld like your opinions
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