Arch Linux Packages Visualization
toofishes.net
toofishes.net
The resulting system you get after setting up Arch is zippy, since you know what's running and what's installed. Compare that to Ubuntu, where there are any number of mysterious background processes happening--it's getting as bad as Windows these days.
On the other hand, I agree with you about the wiki; there's a lot to be said for having such good documentation on installing and configuring something as complex as GNOME or KDE.
edit: As noted by another comment, yaourt is the way to go.
To be honest though Arch moves too fast for me and there are quite a few advantages for not, I use ubuntu though because it is easy.
I strongly recommend AUR and Arch. I use yaourt and I can update my AUR packages just as easily as I could if they were real packages -- just pass the --aur flag after -Syu (I also generally use --noconfirm, though this is dangerous and you shouldn't do it). Occasionally I use aurget to build a package if I know I will be using it a lot, because yaourt doesn't save the compiled project (it is saved in /tmp and deleted after the operation completes -- good for dependencies, bad for apps that you intend to modify or build often).