I would wait a week and then consider shopping Beltre in an attempt to get some SP help. Play Kendrick at 1B and Miggy at 3B until Howard comes back, then put Howie back at Util.
You also need to pay attention these first few weeks and see what pitchers get off to hot starts and snag them. I got Mat Latos in '10 and Ian Kennedy in '11 off waivers early on. Get that type of pickup and trade for some help and you will have a well rounded team.