US STOCKS-Futures edge lower after Dow, S&P hit records
* Existing home sales data on tap
* Goldman cuts Boeing to sell rating
* Valeant, Salix agree to merger deal
* Futures: Dow off 35 pts, S&P off 4 pts, Nasdaq up 1 pt
By Chuck Mikolajczak
NEW YORK, Feb 23 (Reuters) - U.S. stock index futures dipped on Monday, after the Dow and S&P closed at records on the heels of an agreement by euro zone finance ministers to extend Greece's bailout by four months provided it draws up a list of reforms.
* Greece will present its economic reform plans on Monday to seal the euro zone financial lifeline, but the government drew criticism from a veteran leftist and ruling party member that the deal let voters down. The deal is conditional on Greece's European and IMF creditors accepting the reform list.
* The equity market gains led each of the three major Wall Street indexes to their third weekly advance on Friday, with the Nasdaq on an eight-session winning streak as it closed in on the 5,000 mark for the first time in nearly fifteen years.
* Existing home sales data is due at 10:00 a.m. (1500 GMT), the first in a flurry of economic reports this week that will help investors gauge the strength of the housing sector. Continuación...