DecisionLink, an Atlanta-based company that provides software for cost-benefit analyses of business services from a customer’s perspective, has managed to woo one of Silicon Valley’s top venture firms to invest in its latest $18.5 million round of funding. Accel Partners has a long-standing reputation as one of the Bay Area’s premier investment firms, and it’s leading DecisionLink’s latest round. Their investment comes on the heels of billion dollar valuations for Atlanta companies like Calendly, Greenlight Financial Technologies, OneTrust, and the $800 million acquisition of Kabbage. Atlanta startups are on fire…