Are your original tires 225/60/16? If so, 245/45/18 are the closest match, at 26.7" Outside diameter vs 26.6". The wheels from Custom Wheel Shop (and Supercoupe Performance) have 36mm offset, so they won't rub.
I'm running 255/40/18 on my wheels (with 35mm offset) and have no rubbing issues, but I'm only 26" Outside Diameter, and only slightly wider.
As far as quality tires goes, I run General GMax AS-03's because of how well they performed on my 1999 Mustang GT, and my satisifaction with other General tires (the Alitmax Arctic I will put up to the Pepsi Challenge against a Blizzak any day of the week) and the Altimax RT's are a good tire. I like the AS-03 for a "performance" car because they are an all season, have a 480 AA A treadwear rating, communicate their limitations well, and have a nice, aggressive tread pattern. They're about the same price as the BFG Comp II, and have dramatically more tread life, and enough traction to get you home if you encounter a random snowstorm (relatively common here in MN, even though my car is a spring/summer/early fall only car).
Your mileage may vary, but I like them.
97 Thunderbird LX (The GT Bird)
2003 Explorer WAP block with Modular Head Shop "street ported" heads and Stage 2 PI NA cams, 75mm Accufab throttle body, C&L upper intake plenum, Kooks 1.75" primary/3" collector headers, 2.5" full exhaust with mid mount Magnaflow dual in/out muffler, 24lb/hr injectors, 80mm MAF, Tuning from Don @ www.lasotaracing.com
, CAI that feeds from fenderwell. Jmod, 3.73:1 TL in Mark VIII carrier, Mark VIII aluminum LCAs, 93 Mark VIII driveshaft, PBR brakes (soon to be Cobras), 18x9 wheels with 35mm offset, 255/40/ZR18 Tires, Front and Rear strut/shock bracing, GR-2 shocks, Eibach 1.5" springs, 1989 SC front and rear sway bars.