Question whats the best graphics card for this case?

[potatochango]

Thermaltake AH T200 Tempered Glass Micro Case (Limited Pink Edition), CA-1R4-00SAWN-00​

 

[rgd1101]

budget?

 

[COLGeek]

Thermaltake AH T200 Tempered Glass Micro Case (Limited Pink Edition), CA-1R4-00SAWN-00​

From the case's specs, is can support VGA max length: 320mm.

Source: https://thermaltakeusa.com/products/ah-t200-micro-chassis-ca-1r4-00s1wn-00

Now, knowing your budget, as @rgd1101 asked, would go along way to determine the best you can afford. Also, the specs for the rest of your system would be useful, in particular the make/model of your PSU.