This column was originally published on RealMoney on March 20 at 11:43 a.m. EST. It's being republished as a bonus for TheStreet.com readers.I've written a number of cautionary columns this year, warning readers we're stuck in a rangebound market that's doling out meager rewards to bulls and bears. Last week's rally exposed the gentler side of this bipolar tape and triggered fresh waves of bullish bluster. So what happens next? Logically, this is the proper time to slap wrists and wag fingers. But I'm not inclined to do so, because the trading range could finally break to the upside and let a broad range of stocks, including tech and semiconductors, rapidly advance to new highs. The majority of my growing optimism comes from the bank stocks. In February, the Philadelphia Bank Index (BKX) broke out above two-year resistance at 106 but immediately stalled out. The index wobbled back and forth across the breakout line for three weeks before confirming the breakout last week.