Nirmal Bang's top picks in the sector now are TCS, Infosys and HCL Tech from Tier-I and Coforge from Tier-II.Persistent and Coforge will lead the pack with double digit growth and hence commands valuation premium, says Nirmal Bang.IT index has corrected ~26% on a year-to-date basis capturing concerns of a US economic slowdown.Near-term headwinds include delayed decision making, trade war, and slower Fed rate cut cycle.