The oil price has fallen dramatically and the oil services firms (ETF: OIH) seems to have suffered more than other oil-related sectors. To position a portfolio for a potential rebound in a sector, it sometimes makes sense to buy an ETF that is tracking the sector. For the oil services sector, it may make more sense to pick some of the individual shares that seem to be outperforming the sector [Halliburton (NYSE:HAL), Schlumberger (NYSE:SLB) and National Oilwell Varco (NYSE:NOV)]. John Gabriel has recently written a very informative article about the OIH and its constituents. Read more