At record high, U.S. stocks look to extend breakout

By Ashley Lau NEW YORK (Reuters) - U.S. stocks are poised for more upward momentum even as uncertainty over oil prices and Greek debt negotiations keeps the market on tenterhooks, analysts say. Strong fourth-quarter U.S. company earnings and signs of an overall improving economy, alongside what appears to be the start of a bottoming in crude oil prices, have given equities support. As "stocks have found a footing, people aren't as afraid of the potential negative" stemming from re