After 3 years of no trouble with my 15 gallon corny, I can't imagine something much more practical. Large, stainless, fits in chest freezer, costs under $300, liquid and gas ports included.
Only downside is that it's heavy when it's full. But there are easy ways to get around that hurdle.
In a perfect world, a 27 gallon heated and cooled conical next to the brew stand would be wonderful. But for the price, the big keg is a pretty sweet deal.