X100 vs. V1 vs. ???

My photography gear includes a Nikon D90 and FM3a and a collection of nice Nikon lenses. I love carrying the FM3a (with a 40mm or 50mm lens) around for casual shooting as a "have everywhere" camera but the convenience of digital is attractive. On the other hand, the D90 fits my needs perfectly and has an ideal set of features for me, but it's too big to carry around everywhere (although I don't mind carrying it, with a bag of lenses, when photography is a primary activity). Options for an "everywhere" camera? I admit I haven't actually had my hands on any of these cameras (since the Fuji is always out of stock and the V1 hasn't been released yet) and I'm just thinking through options (i.e., this isn't a review; it's me thinking out loud about if/what I want).

Fuji X100

Upsides: Good, simple controls; a fast lens; groovy retro styling; the relatively large sensor.

Downsides: I've read that the focus system is a bit slow; not sure how I feel about a fixed-lens (I like that it's a prime lens, but will it be limiting to not be able to swap out for other lenses?).

Nikon V1

Upsides: Compact, with (in the future) a system of small lenses; some interesting new technologies; using my other Nikon lenses with an adaptor...the 35mm 1.8 and 50mm 1.4 are interesting possibilities.

Downsides: Relatively small sensor...I'm not as worried about the image quality, but the limited ability to have a really shallow depth of field is a bit of a concern; lack of buttons/knobs for key controls, instead having to dig around menus.

A micro 4/3rds system camera

I admittedly don't know a a lot about these systems; is there a small m4/3 camera with a viewfinder and good manual controls? Do I want to invest in another lens system (admittedly, the V1 would lead down this path as well)?

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Probably the best solution would be a Leica M9 with a handful of lenses. But I'd have to sell a kidney and all of my guitars to go this route!

Update (10/7/11): I decided on the X100; the two downsides (slow[?] focus and fixed lens) are fine given that if I want to shoot sports or carry a kit of lenses I'll take my D90. The appeal of the X100 is that it complements my Nikon system; I shouldn't expect it to have all the same features in a smaller package.

The X100 is hard to find, at least at it's list price...Given it's scarcity (non-reputible) on-line retailers seem to be jacking up the price and it's backordered at all the places I like to shop (both on-line and locally). But Crutchfield seems to have just received a shipment, and one is on its way to me!