My answer would be gentoo, you compile from source and ebuilds are easy to work with.
Still a waiting game to install though but very easy, completely ignore genkernel it's worthless and with a lot of problems.. kernel 3.9.0-rc4 is very stable for an rc release. <-- it's what I use.
It's also very stable once you get it up and running, but if you want something like arch I'd probably go with either Debian Sid(or siduction) or Gentoo(funtoo is also available, but it doesn't have the latest packages in it's portage tree like gnome 3.8 for example...)
I'll be nice, here's my make.conf, edit for your needs.
# --[Compiler Flags]-- #
ACCEPT_KEYWORDS="~amd64"
ACCEPT_LICENSE="*"
CHOST="x86_64-pc-linux-gnu"
CFLAGS="-march=corei7 -O2 -pipe"
CXXFLAGS="${CFLAGS}"
MAKEOPTS="-j9 -l8"
# --[Portage Settings] -- #
PORTAGE_NICENESS="10"
PORTAGE_ELOG_SYSTEM="save"
PORTAGE_ELOG_CLASSES="warn error info log qa"
PORTDIR=/usr/portage
# --[Layman Settings] -- #
#source /var/lib/layman/make.conf
#PORTDIR_OVERLAY=/usr/local/portage
# --[System Settings]-- #
LINGUAS="en_US"
ALSA_CARDS="hda-intel"
INPUT_DEVICES="evdev keyboard mouse joystick synaptics"
VIDEO_CARDS="nvidia vesa"
# --[Use Flags]-- #
USE="bindist mmx sse sse2 sse3 bash-completion branding cleartype corefonts
truetype unicode dbus fontconfig gnome gtk gtk+ opengl qt4 qt3support X
cdpau webkit cups python ruby ffmpeg alsa ogg flack mp3 mp4 nvidia cuda
quicktime jpeg jpeg2000 midi png wav raw scanner libnotify ncurses
mudflap musepack musicbrainz networkmanager wicd nptl pam pango rss sasl sdl
sqlite startup-notification svg tiff usb vorbis wavpack wifi x264 xorg
xscreensaver xv xvid zlib zip unzip unrar theora declaritive sql script"
# --[Gentoo Mirrors]-- #
SYNC="rsync://rsync.us.gentoo.org/gentoo-portage"
GENTOO_MIRRORS="http://mirror.mcs.anl.gov/pub/gentoo/ rsync://mirror.mcs.anl.gov/gentoo/ ftp://mirror.mcs.anl.gov/pub/gentoo/ http://mirror.datapipe.net/gentoo ftp://mirror.datapipe.net/gentoo http://gentoo.mirrors.easynews.com/linux/gentoo/ http://chi-10g-1-mirror.fastsoft.net...too-distfiles/ ftp://chi-10g-1-mirror.fastsoft.net/...too-distfiles/ http://www.gtlib.gatech.edu/pub/gentoo rsync://rsync.gtlib.gatech.edu/gentoo ftp://ftp.gtlib.gatech.edu/pub/gentoo http://gentoo.mirrors.hoobly.com/ ftp://ftp.ussg.iu.edu/pub/linux/gentoo http://lug.mtu.edu/gentoo/ ftp://lug.mtu.edu/gentoo/ ftp://gentoo.netnitco.net/pub/mirrors/gentoo/source/ http://gentoo.netnitco.net http://gentoo.osuosl.org/ http://gentoo.mirrors.pair.com/ ftp://gentoo.mirrors.pair.com/ rsync://mirrors.rit.edu/gentoo/ ftp://mirrors.rit.edu/gentoo/ http://gentoo.mirrors.pair.com/ ftp://gentoo.mirrors.pair.com/ rsync://mirrors.rit.edu/gentoo/ ftp://mirrors.rit.edu/gentoo/ http://gentoo.mirrors.pair.com/ ftp://gentoo.mirrors.pair.com/ rsync://mirrors.rit.edu/gentoo/ ftp://mirrors.rit.edu/gentoo/ http://gentoo.mirrors.pair.com/ ftp://gentoo.mirrors.pair.com/ rsync://mirrors.rit.edu/gentoo/ ftp://mirrors.rit.edu/gentoo/ http://gentoo.mirrors.pair.com/ ftp://gentoo.mirrors.pair.com/ rsync://mirrors.rit.edu/gentoo/ ftp://mirrors.rit.edu/gentoo/
http://mirrors.rit.edu/gentoo/ ftp://mirror.iawnet.sandia.gov/pub/gentoo/ http://mirror.iawnet.sandia.gov/gentoo/
ftp://gentoo.llarian.net/pub/gentoo http://gentoo.llarian.net/ ftp://gentoo.mirrors.tds.net/gentoo
http://gentoo.mirrors.tds.net/gentoo http://ftp.ucsb.edu/pub/mirrors/linux/gentoo/ ftp://ftp.ucsb.edu/pub/mirrors/linux/gentoo/
ftp://ftp.lug.udel.edu/pub/gentoo/ http://mirror.lug.udel.edu/pub/gentoo/ http://gentoo.cites.uiuc.edu/pub/gentoo/
ftp://gentoo.cites.uiuc.edu/pub/gentoo/ rsync://gentoo.cs.uni.edu/gentoo-distfiles http://gentoo.cs.uni.edu/
http://mirror.usu.edu/mirrors/gentoo/ ftp://ftp.wallawalla.edu/pub/mirrors/ftp.gentoo.org"
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