The key to really great kit wines is time IMHO. I'm willing to bet the $20 bottles of wine you want to compare to have spent at least 2 or 3 years in the bottle. Get a kit with skins and let it age a few years. I've tasted many good kit wines that were a year or less old, but they really need a year or 2 to integrate and mature. Best biggest red kit I've made was the Cellar Craft Showcase Red Mountain Cabernet, but I added a bunch of heavy toast french oak. It was crazy oakey the first 2 years, but then smoothed out into a delicious wine I would be happy paying $20 a bottle for. In my opinion, red wines are just harder to make well, and kit wines are even more so. Living in Southern Florida we've noticed we drink a lot more white wines these days, and I think making a beautifully delicious white wine that can compare to $20 to $30 commercial bottles is a lot easier.