The last report that I read about RJ is that his best case scenario target return date is July 8. I wouldn't count on him being back by then, because these things always get delayed but it does look possible that you will get at least a couple months of production out of him. The concern is that the knee will be a recurring problem all year and will flare up after his starts causing him to miss starts and maybe eventually be shut down for the season.
Schilling is out until at least the all star break as a best case scenario. Again, don't count on that happening but the DBacks might be looking to trade him so want him back for a few starts to show he still has it. Vlad apparently will not likely need back surgery and the Expos said he could be back by the all star break. That's probably overly optimistic as well, but he could well be back in August giving you two months out of him. Even if he comes back at 80% of his form, he would be very productive, especially for h2h leagues that count on playoffs the last few weeks of the season. Don't expect him to be stealing bases though.