IMO you have to weigh the opitions, general rule of thumb i've been told and find to be true is: you can move 7 days after breeding after that you should wait til 28 days to move again.
If you consider Hoover Dam make sure you got one that is great on the front legs. Just seems like the few i have seen have all had a bit of an issue when moving on the fronts.
The way i look at it you have 3 cows with some experience and 3 heifers. My advice is take Jody's list on the cows. On the heifers find a angus bull with calving ease genetics for the heifers. To me SAV Pioneer isn't a bad choice by any means.