>>312121186
>What should I be concerned with
What games will you play. Whether the PC you have can run those games comfortably. Whether you're comfortable with Zuckulus.

>What is the difference
At the moment the choice for headsets is between:
Index - Overall the best but no longer best in any single aspect
Quest 2 - Amazing value for money, especially since you can use it for PCVR and standalone, but you have to deal with Zuck and inside out tracking
Original Vive - Dog shit, only good if you want FBT for VRChat as cheap as possible
Reverb G2 - The only in-between for the Vive and Index. Unfortunately inside out tracking only. Wait for reviews before pre-ordering.

>Cheap but futureproof
Hopefully gen 2 soon^TM but at the moment probably the Quest 2, maybe the G2. Index if you have the money and are willing to wait for Valve to get off their ass and make more