I'm not sure how much an ARB would cost installed, but its got to be a good chunk of change. One option that you haven't mentioned it getting the
Mopar D44 Rubicon axle. It comes with an elocker, 4.1 gears and is stronger than your D30. All for $1480 plus freight. You can offset the cost by selling the D30.
I think that I also saw in JP magazine or something in the Jeep section at Barnes & Nobel an article where they got one of these axles from a vendor that would change out the gears for you before shipping. I can't recall who it was, but it was there.
As for winch... I'm really fond of the Superwinch EP9 even though I just got a Smittybilt XCR8. The new XCR8 looks like its made by T-Max and has the same specs as their 9K winch. With the good reviews I'd read on Pirate and the price... well, it was a deal I couldn't pass on.
Air, take a look at a CO2 system (like Powertank or The Source) and keep a cheap Masterflow compressor as a backup. I've got the cheap compressor... now all I need is the Powertank LOL :laughing: