Which 2nd hard drive for my MBP 2011? I am looking at options for a 2nd hard drive (SSD is primary) for my 15" MBP 2011, i initially was going with a 750gb 5400rpm drive but i'm thinking about either of the following 7200rpm  drives.  

1) Western Digital Scorpio Black WD7500BPKT

2) Seagate Momentus ST9750420AS

I will be running lots of Virtual Machines so i'm thinking the faster drive would be a better fit.

Are there any concerns with noise/vibration/battery drain with either of these faster drives ?
I have the Seagate in my 2010 15" MBP and I have had 0 problems with it.  It's dead silent and there is no vibration.  My battery life stayed pretty much the same after the upgrade, but since you are looking at dual hard drives (I'm assuming you removed your optical drive) I would expect to see a slight drop in your battery life.

I would stick with the 7200rpm drives over the 5400rpm myself.