>>3795398hmmm... you could get something like the nikkor 28-80mm for $20, and a 50mm 1.8 for $80. The 28-80 isn't anything to write home about but pic related is a recent example from it. It's really not so bad.
Also you mention f5/f100/f6, consider looking a rung or two down the ladder. There's significant money to be saved, sacrificing mostly weather sealing and ruggedness while keeping autofocus, metering, and a lot of other features
