PR doesn't really matter unless you are selling links. I've got PR1 and PR2 sites that are a few years old now that still bring in a very nice income every month.
PR10 is the best but for a newbie 3 or 4 will bring you some good traffic, just keep building those back links
My site was a PR3 but drop to Pr2, this may seem strange but since the drop my traffic has jumped from 100 vistors to 400 per day, so l guess page rank is not importan,t only if webmasters want to link