Sullivan's Steakhouse Steakhouse  style restaurant, Located at: 5525 Concord Pike Wilmington, DELAWARE   Phone Number 302-479-7970           Hours of Business: Dinner Nightly 5:30-11 p.m.           Average Price: $25                   Bone-in Kansas City strip, seared ahi appetizer and decadent soufflŽs. Upscale, retro interior of mahogany walls. Extensive wine list. Live jazz