We recently toured Rome with private guides from Gioia Private Tours & Trips. They provided a wealth of fascinating history, facts and perspective while we covered the top sights as well as lesser-known sites, with no waiting in line. It was worth the price.
Roberto Contursi, Gioia Private Tours & Trips, 4 Francesco Netti; 011-39-335-525-2852, http://www.tours-europe.com. Half-day tour about $353; full day about $523. Admission fees not included. Cost covers up to three people in a golf cart or up to six in a regular vehicle. Winter prices valid until March.