Navi-X is kind of old and clunky, it's good to have that as an option but you'll be much happier with the new, more intuitive programs, as I hardly ever even open Navi-X anymore (in fact, it won't even work on jailbroken AppleTV 2 devices anymore). Be wary of some of the "streamlined" Addon options out there. One such animal is XBMC Hub (now known as Addons Hub) which promises to install all the best add-ons and repos in a simple step, but it also installs a lot of crap and will alter your interface. It is possible to undo much of it, but you then might as well do everything from scratch in the first place. There is the Fusion repo (from the same source as the XBMC/Addons Hub), but as long as you stick to installing the addons you want instead of letting the Hub take over, it's fine. There is also the Lamda Repo and Super Repo. Between those you can find all of the addons you'd likely want...Sportsdevil, 1Channel, IceFilms, Genesis, Project Free TV...those are what come to mind. I don't have them handy at the moment, you can find the repo sources online by address, then in the addons section, input the location as an "add from zip file". I haven't added anything in a long time so I can't remember the exact menu names (I'd imagine the youtube videos handle that, just change the address, as it is likely many of the youtube videos will be from that XBMC Hub guy. For skins, I find that Amber is very efficient and quick and responsive, but it's more about what you're comfortable with.