Not sure if you have a Trader Joe's around, but Trader Joe's Organic Balsamic Vinaigrette is good. It's mild, not too "vinegar-y". No HFCS, it's only 60 calories for 2 tablespoons, and a little goes a long way. (Note: This one is found in the non-refrigerated section. The balsamic vinaigrette found in the refrigerated section is non-organic and has double the calories).
Edit: Oops - just noticed you don't like vinegar (but I swear this one's mild!! )