I really like the type S, I don't really see a good enough reason to try to hunt down RF silent sliders for an already silenced board, but that's just me, maybe someone might feel like they are totally different in feel.
As far as 55g domes, the way I got my hands on 55g domes was trading my 45g domes and a good soul traded me his 55g for my 45gs.
Once I get my old board back I'm going to buy some hypersphere rings and add them onto ol reliable with her 55g domes and lube the stems too.
krytox 205 and 103 mix has been recommended for quite a while.
You want something thicker for topre and 55g more so.