>>292647694
You can actually make do with surprisingly little space to play VR, although it may be a struggle for faster paced games, so I wouldn't worry about that.
Be aware that the Index may not even ship in 8 weeks anyway, but it is the best headset available on the market, so if you want to go all in that's what you should buy. Rift S/ Quest are the most cost efficient option, so consider that if you don't want to wait too long.
In terms of new releases, the only headset which might come out this year is the new HP one, but we haven't heard about it in months so it may have got pushed back. I wouldn't worry about any hardware you get now becoming significantly outdated within a year or two anyway.