If money were not an object RCBS Pro-Melt and a close second Lyman Mag 20 and Third Lee Pro IV-20
RCBS Great temp control, never seen one drip nice pour but does better with the lyman guides
Lyman relaible control but not as good as the RCBS but has an outstanding guide system
Lee Pro 0 after some modifications added weight to stopper rod has done a great job
I have used all 3 and although I am very happy with my Lee Pro I still dream of the RCBS