RB in the first round and 2 in the first 3. If you don't do that you kill your team.
I think it really comes down to how you feel about your ability to find a couple of solid RBs in the 2nd and 3rd round. I agree that you've got to take two of your RBs in the first 3 rounds.
I'd say that the biggest thing is getting a guy in the first round you feel will give you at least 12-15 points every single week, with the upside for 20-30 points in any given week. Consistent production.
If that guy is a wide receiver rather than a running back, I think that's fine, so long as you shore up RB later on.