Panasports are a good option for ITC and hold up fairly well. Last ones I weighed were 10.5 to 11 pounds on a postal scale in a 13 x 6.

If looking used, check some used OEM alloys- If you are running SCCA, you can use 13 or 14 or 15 inch diameter wheels but nothing wider than 6". This opens up a variety of OEM alloys (used) but the larger outer diameter of a 14 or 15" tire may have a negative impact on gearing, depending on where you run.