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Have I missed the 900D builds??
Try the MM?
Its the CM Cosmos 2, if you don't want to spend that much on a 600T then you should be looking away from the Cosmos
Member's Market, it seems that you dont qualify for it as of yet, need more post counts
As for alternatives, have you looked at the Fractal Arc Midi R2 or the Define R4?
Also look at the Corsair Carbide 500r or the NZXT Phantom 410
By upgrades you mean watercooling?
Take a look at the Arc Midi R2