The current order is (including one skill either side) Stacker*, Basher, Fencer, Miner, Digger, Cloner.
* Grenader if it makes it in. Spearer if it makes it in but Grenader doesn't.
A directly-upwards laserer might be an upwards analog of the digger, and perhaps one could extent that argument to a 6:1 laserer, but a 45 degree laserer is not.