CS First Boston cable analyst Lara Warner initiated coverage of Insight Communications Co. with a "neutral" rating and a 12-month price target of $15, citing strong growth metrics. Warner pointed to steady cash-flow and new-service growth — and the largest average monthly revenue per high-speed-data subscriber figure in the industry ($46.13). At 10.6 times 2003 cash flow, Insight trades above peers Mediacom Communications Corp. and Cablevision Systems Corp. But Warner sees an upside of about 20 percent to current levels. Insight was priced at $13.43 (up 7 cents) in late trading Jan. 15.