Assuming you need dGPU for display only and not gaming as 730 is incredibly weak. If you do plan on gaming, consider increasing your budget slightly and buy AMD RX series card (better bang for the buck).
Depends on what you're actually aiming for? If it's something related to any gaming so I hate to break it to you, it wont do any good to you. Let us know the purpose and your system specs so would be able to share some useful thoughts.
Yeah, a new non VR SP IP or a sequel would be best. They can't count to 3 so a sequel doesn't seem likely. Portal is my favourite and would love a sequel but don't expect one. I think I'll take whatever if they bring it on consoles too. Might go for VR as well.