Actually, the F100 is more camera than you'll probably ever need. The N90S is really good too. I have them both, though I prefer to use the F100 because it just feels better in my hand. It eats batteries at a faster rate than the N90S (I don't have external batter packs for either camera) but the batteries are the ubiquitous and inexpensive AA alkalines that you can buy in bulk at the big warehouse stores like Home Depot, Lowes, and Costco in the US. The F4 is a very good camera, but it is larger and heavier. The one feature it has that the F100 lacks is that it will operate the matrix metering system with manual focus lenses. Honestly, matrix metering is not a deal breaker for me. As far as I'm concerned, it offers me no real advantage. After many years of experience, the meter is to me more of a suggestion than an absolute and I rarely use any auto-exposure camera as such.