We played 4e for years and then came to the end of our Eberron campaign. We decided to try the D&D Next playtest until figuring out what we would do next. That was more than a year and a half ago. Since then we have tried tons of systems. They range in complexity and genre and just about everything else. We have tried out Fiasco, FATE, Mutants and Masterminds, Dungeon World, World of Darkness (Changeling) and others that I am sure I am forgetting.
We have also played TONS of board games. My collection has grown quite large. We also have pretty much all started painting minis thanks to BONES and even tried out Song of Blades and Heroes because of it.
What I come to you for is advice. The little hobby time I have during the week currently gets eaten up with primarily painting, cardstock terrain building and forum browsing (mostly the latter). I really enjoyed playing in the two or three sessions of Dungeon World that I have had the chance to. I have no experience running it, but it seems fairly simple to pick up and run with. On the other hand, D&D4e could be easier to find players for and our group has shrunk in size recently (lately it has been four of us at the table).
Please help me sway my opinion. Thanks 
I encourage you to run an Eberron game using the D&D NEXT playtest rules. It is very a cinematic, face paced, and elegant (read easy) to run system.
I have not yet played Dungeon World, but I hear it's GREAT. That said, I've been running an Eberron campaign since March of 2011 (30 months now), we started using 4E rules and just switched over to NEXT rules about a month ago and it's a joy to play.
Striker - is Next fleshed out enough to play a paragon game?
Napolean, definitely!
Especially now that the rules for WarForged have been released, there is enough to go on.
Don't get me wrong, the NEXT Bestiary is pretty barebones; you're not going to finding rules for Dolgrimm or Valenar Elves or Vulkoor's Drow/Scorpion Hybrids. Truth be told, as a DM I have to do a lot of reskinning. I also do a lot of homebrew rulings (dragonmarks is the big one).
That said, I have 5 players (1/2 Orc Barbarian, 1/2 Orc Dragonmarked Rogue, Tiefling Aberrant Dragonmarked Mage, "Kalashtar' (used elf and home brewed the telepathy) "Swordmage" (using Monk of the open palm here, reskinning unarmed attacks as a sword), and a Halfling Cleric (war domain). They're all 11th level.
The Rogue, Barbarian, and Cleric ALL get two attacks per round, the Monk is usually doing between 3 - 5 attacks/round, and the Mage's spells are BOSS.
Our first combat encounter in the new system was x3 Hezrou demons (9th lvl creatures each with over 100 hp and resistant to most damage) and while the party's nose got bloodied, they quickly handeled them.
The next combat encounter I have set will feature an 11th level creature of the Draconic variety: we'll see how they hold up!
I am excited to see how far NEXT stretches, but so far, it's been really nice to move into a ruleset that allows for such 'quick solution creativity'.
I, personally, am not a fan of D&D Next. If I run an Eberron game again, I would go with 4th edition, or possibly Savage Worlds or 13th Age.
Totally agree on which systems to use! Savage worlds or 13th age are awesome. I had a chance to play 13th age for the first time this last weekend at the Escapist Expo.
Additionally, I believe Keith Baker has even posted something on his blog regarding his opinions on how best to use 13th Age in an Eberron Setting.
Ogiwan, I really appreciate your signature regarding inclusivity and working together.