I don't like the pricing model. I was hoping for an a la carte VA service; I don't want to pick a plan!
But if you stick with plans, I have 2 small suggestions for the sales page:
1) "Starting at $6/hour" threw me off. That's the price of the biggest plan, which is 40/hours a week! If I have 40/week of VA work, I'll just hire a VA from oDesk!
Instead I would list the price you expect me to pay (with the most popular plan). It looks like that's $10/hour here. Otherwise I've anchored at $6/hour and its going to be an uphill battle to sell me on a 2x increase.
2) Make one of the plans the "default"! The pricing table has 4 options, but none are highlighted as the most popular/suggested/default. The little flag actually makes Ultra look like the default at first glance, which I don't think is the intention.
Hope that helps! It looks like a very compelling service.