Cube my Force Shield?

Well, the thing is that your plans are all over the place now and you don't have to cube your Aran's secondary to stay with it, do you? If you don't have any solid bossing plans and a permanent main in mind my recommendation would be to keep the NX until you've a better idea of what you want to do, as GMS is always going to have cube packages and Miracle Times even if it takes you months to decide.

Whichever you choose to do in the end, good luck in getting the best out of your NX.