The R5 2600 would be ideal for keeping up with the RTX 2060. The GTX 1060, RX-580/590 are more than adequate for 1920 x 1080 @ 60Hz. Even the GTX 1070 if you want higher frame rates for
less visible benefits like input lag.
Holding out for the latest and greatest also has its benefits. But keep in mind, there will always be something better just around the corner. As to the Rzyen 3000-series, it appears at this time that the release date will be sometime in Q2. Maybe along with the 500-series boards as well. But when new tech is announced, it usually sells at a premium for awhile.
As to the gfx cards, The AMD Navi looks to be a July launch. The Nvidia GTX 1660, 1660 Ti is set to launch in Feb.