If your training an NT player, they will likely have a large salary. I'd still go with a L5 and save up money for that salary.
Unless I was some rich manager from say the Bahamas and have no comeptition and had won the b3, maybe id consider it just for kicks. Otherwise the current market rates are absurd for how little increase in training you get.
"Well, no ones gonna top that." - http://tinyurl.com/noigttt