If you're used to Nikon's digital SLRs, the N80, F5, or F100 would be the best choices as they have the same basic control layout as the digital Nikons. If you prefer manual focus with traditional control layouts, the F3 or F4 are both good choices. The F4 has AF but it is not as good as the AF in the N80, F5, or F100. The N90 is popular because it has better AF than an F4 but is smaller, lighter, and a lot cheaper.