Best prenatal vitamins

Okay ladies! Hubby and I are TTC after 4 years of an MC, had a very difficult MC at about 16 wks due to low progesterone levels in 2011 and haven't wanted to try since.. however, now we want to start trying again.. my doctor said it could help my progesterone levels if I take prenatals even before conception. My question to you ladies is, what do you think the best prenatals would be??