Investing.com - First-quarter earnings are expected to be strong all around, but Goldman Sachs (NYSE:GS) says there's still reason to be picky.The Wall Street firm favors companies with organic sales growth over ones benefitting solely from the corporate tax cut.In a note to clients, Goldman said it sees strong double-digit sales growth in the energy, materials and information technology sectors.Goldman says the tax cut will benefit some sectors more than others, with telecoms and consumer discretionary companies the biggest beneficiaries. The firm's top picks include, Amazon (NASDAQ:AMZN), BlackRock, Celgene (NASDAQ:CELG), Lam Research (NASDAQ:LRCX) and Netflix (NASDAQ:NFLX). Overall S&P 500 earning are expected to grow by 17.5% in the first quarter.