The Sensex is likely to open with a bang, and continue to trade firm for the day. Some amount of profit taking may be seen at the fag end of the day. The index is likely to face resistance around 12,385-12,405-12,425 levels. On the downside, the index may find support around 12,255-12,235-12,215 levels.According to market analyst Shah, the Sensex is likely gain upward momentum today and may touch 12,700 within the next 2 or 3 days. He cautions traders not to remain on short side.Stocks to watch today are BHEL, Reliance, Tata Steel, Bank of Baroda, Punjab National Bank and SBI.Another analyst Bharat Momaya, Sensex is heading to surpass previous high of 12,671 points. Bulls are in full form and markets should maintain strong upward trend. Bear speculators should remain over cautious lest they shall be caught in sudden upmoves.