Measure network performance with system.diagnostic - which counter(s)?

I want to use the system.diagnostic.performancecounter to find out if there is heavy traffic through the network card of the machine hosting my console app. There are several counters that look promising but I'm not sure which ones to use for a good indication that the network card is under a heavy load

Here are some of the ones I've seen through perfmon:
Packets/sec
Packets Sent/sec
Packets Received/sec
Bytes Total/sec
Bytes Sent/sec
Bytes Received/sec