Mikhail Skill Build.

The only issue with Radiant Buster is that it doesn't have the vertical range that Driver does. So if vertical range is somewhat desirable in a map then Driver can still be useful.

TBH the only time I've cared about vertical range, when training, is at the Training Knights A & B rooms in Stronghold - some classes can hit mobs from the entire map at once (ground floor, lower and upper platforms), some can't. Specifically, my Paladin (with ACB) and Aran (with Triple+OS) can and my Dark Knight (Dark Impale) cannot.