I do have a Powerlyte Scepter kit and I do like the longer inserts but since its discontinued I've had problems collecting all the inserts so it matches up with the different paints I use at different fields. I'm also really limited on barrel fronts and backs plus I don't think they make an A5 threaded back. I looked into Freak kits but then would have to piece together backs and fronts along with inserts. I ran into the same kind of issue with J&J. I would prefer J&J instead of the speedball look but it seemed pricey to get what I wanted. They do have a really cool feature where you can change the tips. I have a a few different markers and wanted to avoid buying sets or random pieces for the threads. My brother has a salvo with an evil pipe kit that he puts camo tape on and he really likes it. Let us know what you end up getting.
Your Salvo looks good with that barrel. What do you think of the Proto hopper?