Unfortunately the new Citizen's are a new line, not the next gen. The line is call HC (high current). I have been told the HC's use larger Nicha dies. These are looking to be best at high current. The new pricing for CDIWEB is $52 for the 1825 and $93 for the 3618. The strange thing I noticed is they produce the same lumen output @ 150 watts.
As for the dimmers, if you are looking for quality dimmers, they are usually between $20- 30 each. These pots are all consistent throughout the sweep. The $2 one's slowly start to change and then fail.
More testing to see if the improvement warrants the price.