Don't you basically have to build something on that level to play with a valve index or is it overkill? Also seems that in order to play games like Doom Eternal on high/ultra settings you would need something equivalent to a rtx 2080ti ($1000). I also have a widescreen monitor with 144hz So I just figure I'll go stupid and splurge and hopefully I won't have to upgrade for 5+ years.
I built a seperate PC specifically for VR. I think I spent about $1600, but I already had a case and very good power supply.
I've always favored the xx70 level Nvidia graphics cards. I've always felt the premium for going with a xx80 or xx80ti was too high. I was concerned that for VR it would be necessary, but I'm playing everything, including Half Life Alyx at the "experimental" 144hz refresh rate and having no problems at all. If I did have issues I was going to try to hold out for the 30xx series of graphics cards which are coming in the next month or two, but I don't think that will be necessary at all.
Specs for the system I built are:
3600X AMD Ryzen 5 (I haven't built an AMD system in at least 15 years but I'm very happy with this one)
RTX 2070 Super (factory overclocked)
2TB NVMe M.2 SSD Intel 660p (not the best, but very good and very affordable for a 2TB true NVMe M.2 SSD)
ASUS AM4 TUF X570 Plus motherboard
16GB (2x8) 3200MHz DDR4 G.Skill Ripjaws V
You could certainly go a little bigger or newer in a few areas. I would wait for the 30 series Nvidia stuff if you're going to spend big on a graphics card, word is that with more competition from AMD the prices will be about the same as the 20 series stuff.