If you can hold off buying for a bit longer you should, Oddessy is a little demanding in certain areas of the game, and demands are quite hard on the graphics cards and processors.
If you plan on running 3rd party apps, which I think most PC players do, I'd be surprised if they don't, you'd definately want at least 16GB RAM, and somewhere in the 3200Mhz range.
If you can get a Geforce 20 series as a minimum, your get a smoother transistion when doing stuff in settlements & walking about in stations, and still keep relatively high settings.
And if you can get an M.2 drive running about 2500mb/s write at least, everything will load faster too.
This is just my opinion though, I was running a GTX 1060 (6GB) with low end i5 and I was struggling to get good stutterless performance and suffering from chessboard graphics from space.