I hadn't had a credit card in 8 years, began paying cash for everything including cars, but I was renting. Unlike you, I needed a home of my own. Mostly a result of my delinquent credit falling off my reports, my scores were mid-high sixes (were in mid 5's). As soon as I opened 3 revolving tradelines, my scores increased to mid-upper 700's within 3 responsible months of usage. I only use them for credit optimization, nothing more. Now I'm waiting on a home to be built.
myFico TU-715 EQ-778 (01.14.2013) WalmartTU-664 (12.12.12))
LENDER PULL EQ-766 EX-779 TU-713 (12.20.2012)