Give us a call. The question of the 55 vs the 65 is largely on of higher on off. Besides having a lower black ref value with the 65, the higher on off 120,000 to one vs 80,000 may be needed depending on your set up (loner throw/vs short throw, iris iopenung notrmal lamp mode or economy, and the gamma you ru,. If you set up short throwm open iris, and want to run a 2.5 gamma you will probaby need the 65. Set up on the JVCs like most projectors determines the on off that you will get out of the maximum possible for the machine and whether that is high enough to avoid black crush depends on the gamma you wish to run.
The RS45 is a different kettle of sardines, because it is a stripped down machine, no CMS, no multizone convergence, no 4K e shift, no cinema filter and a lower on/off.
Give Mike G or mea call and we can discus whivh JVC might be best for you. I like you had an E home ((500LC Ultra highly modified for many years but I ran HDMI using a Moome card.