The 3070 is less capable than the 3080 for sure, but given what you're intending to use it for (i.e. VR rather than RTX), I think it would be OK. There are issues with supply of the new 30 series cards as well as the new 6800 series AMD GPUs, partly because the high value of bitcoin is driving a surge in mining, but also due to scalpers having bought up all the existing stock to resell on ebay at a huge markup. That said, there's nothing to stop you using your 960 in a new system until these supply issues are sorted and you can buy the one you want. The new Ryzen CPUs seem very, very good and generally outperform the equivalent intel processors in multithreaded applications which may not be so much of an issue for simmers. The improvement in the AMD stock has caused an increase in their prices so while they might still be a bit cheaper, it's not by as much as it used to be.