Putting together my Rome rig:
Olympus OM-2 w/24, 50, and 135mm lenses.
Olympus Stylus Epic
My plan is to burn a shitload of slide film (cross-processing) with the Stylus and the Diana, and a buttload of t400cn in the Holga. At night I'll be shooting mostly print film in the Stylus and maybe the OM. The OM is known for its low-light metering, which I haven't messed with a lot, so I'm looking forward to exploring its capabilties in that department.
I'm a little reluctant to drag the Fuji with me; it takes beautiful pictures, but I haven't really got much that's really inspiring to me with it. I plan on hitting the streets with it at dawn a couple of days and try and get some gorgeous, boring shots. The Holga and the Diana are much more exciting to me right now, so I'll probably sell it after I get back.
With the OM I'm mainly excited to get over there with the 24mm lens. On the last trip I had the Minolta SRT with only a 50mm lens and had a very hard time getting enough distance from the subject. I really need to do a lot more work with the 24- it has the potential to make some really dynamic looking shots. Also, after shlepping the SRT the compact size of the OM is going to be nice. I'm not really much inspired to use the 50 and 135mm lenses, but I feel obligated to take them.