US STOCKS-Wall St flat after best weekly gain of 2014; Nasdaq up on Tesla
* U.S. home builder sentiment plunges in Feb- NAHB
* Forest Labs surges after Actavis confirms acquisition
* Tesla shares hit all-time intraday high
* Indexes: Dow flat, S&P up 0.1 pct, Nasdaq up 0.5 pct
By Angela Moon
NEW YORK, Feb 18 (Reuters) - U.S. stocks were little changed on Tuesday after Wall Street's biggest gain of the year as disappointing economic reports weighed on investor sentiment.
Data showed U.S. homebuilder confidence suffered its largest one-month drop ever in February, hit by this winter's relentlessly severe weather and concerns about the costs of labor and building lots.
A separate report showed New York Federal Reserve's gauge of manufacturing was weaker than expected in February after hitting a 20-month high in January.
But a bright spot came from the mergers and acquisitions field. Shares of Forest Laboratories Inc rocketed nearly 30 percent after Actavis said it would acquire the specialty pharmaceuticals company in a massive cash and stock deal valued at about $25 billion. Continuación...