Shoes, Shoes, Shoes-Which one should I choose for walking/running?

The past month and a half, I have been working out consistently.  I am now walking about 3 miles with a little bit of runing in there.  I am doing the eliptical machine also, which is kicking my booty!!  I am looking for a good pair of walking/running shoes.  Here is what I have found so far...

The Reebok Zigtechs--PRETTY cool!!





Asics Gel-lpera Studio Training Shoes




Saucony Grid Flex Running Shoes (GREAT arch support)

So many decisions and great shoes out there!!  Can't wait to find a pair that is suitable for me!!