Oil tankers stocks

At the moment the only stock available from this branch is NAT (Nordic American Tankers) which might not be the best choice for long position. There are variety of other competing companies of similar or higher market cap adding which could provide some attractive alternatives to existing one. My suggestions are:

DHT:NYSE (DHT Holdings Inc)
DSSI:NYSE (Diamond S Shipping Inc)
EURN:NYSE (Euronav NV)
FRO:NYSE (Frontline Ltd)
STNG:NYSE (Scorpio Tankers inc)
TNK:NYSE (Teekay Tankers)

Adding them would be very much appreciated.