After talkin to dusty and MMandley i decided to go with the 1617 im still runing stock on my 2011 xlv and after the winter ballast upgrades it would just not give the performance i want imo. dusty and mmandley both gave the 1617 high reviews but the 1847 was rated really high as well. lots of people have had good things to say about the 1847. as for the 1235/1433 i seen alot of people sayin they had one . i never found anyone talkin bad about them but i also never heard anyone just raving about how great they where either. i have never had anythin but stock myself on my boat but next yr when i get my 1617 on ill post up some detailed stats so we can add to the wealth of knowledge on the forum