I've had my fun with private servers. When I first started all the servers were based in Varrock west and you could spam click for mass hits and stuff, it was amazingly fun.
That's the one I'll be playing as well, once it's out.<3
I still browse Mopar these days, for old school type servers, which is why I'm interested in Rs2006 that's finishing up, but haven't really had too much luck. Nearly all seem to whitescreen for me atm.
My favorite private server was Storkpk. It was a runescape classic private server and when you gained levels you could edit your stats. It was just a cool feature. Boxing was tons of fun. Was so sad when they decided to close it.