I own 2-3 aStores which just PR2 & 3 only. Here it is PR2 PR2-3 PR 5, oops can't imagine that I can do, But I ever saw PR5 aStore before. weelement is the answer
The path of least resistance is to get several pr6 or higher, inbound links, and that'll do it. Once you get the links, you'll see your pr go up quickly. I wouldn't waste the effort on an astore though, a pr5 will go alot further on a site of your own. . thanks, PuReWebDev