Many companies, when you say "gee, I'd love to start two weeks from now, but my next batch of RSUs doesn't vest / bonus doesn't come until two months from now."

Many companies, when you say "gee, I'd love to start two weeks from now, but my next batch of RSUs doesn't vest / bonus doesn't come until two months from now.", will cover what you're losing out on (or will meet you halfway) with a hiring bonus or something like it. Don't let a little vesting keep you from grabbing an opportunity. Two-months-from-now you will probably look at that next chunk of vesting RSUs the same way Right-Now you is looking at the upcoming one. Meanwhile, things are moving really fast at small companies and Two-months-from-now you missed a couple months of it.