Where to find a good IP with high uptime, low ping and running the bitcoincore version 0.15.0.1 ?
For a node with high uptime, running a specific version of Core, you can find it at
https://bitnodes.21.co/nodes/leaderboard/.
With regards to the ping, it is relative to your internet connection and distance from the node. The best would be to find one in your own country on the leaderboard.