NEW YORK ( TheStreet) -- Here are five ETFs to watch this week.SPDR S&P 500 ETF ( SPY) The bull market turned three at the end of last week, celebrating with another encouraging jobs report. This promising news made for an optimistic end to a choppy week of trading. In the opening months of 2012, we have seen some solid signs of improvement. However, it is clear that hurdles remain. If the marketplace can follow up Friday's jobs number with some strength, a return to the highs for the year could be in the cards. Even in periods of optimism, however, it is important to maintain a level of protection. It is unclear when the next market-moving headwind will surface.