You can't go wrong with an F3hp.
The meter batteries will last 9-12+ months, depending on use. I have never had the batteries in my F3hp crap out in any less than 12 months. If battery failure is a concern, carry an extra pair of SR44 batts, or change batts every 9 months or so. Problem solved.
The only drawback to the F3 is its weight - it is not a light camera like the FM2n is. Yet it the tank-like build that makes the F3 so relentlessly durable and reliable. It is damn near indestructible. It is a system camera, with interchangeable focusing screens, viewfinder assemblies, etc. It has a motor drive unit as an optional add-on that will give you 4 fps with AA alkaline batts or 6 fps with the MN-2
Ni-Cd Battery Unit. The F3 also has mirror lock up and depth of field preview. It also has an eyepiece shutter for blocking out stray light during long exposures; it is a workhorse pro camera that is loaded with features.