The dual Dovetail bases from Leupold, Burris and Redfield will be fine. The Leupold bases are the best looking....
Anyone should know the advice you get from the majority of Bass Pro, Cabela's and Gander Mountain big box stores will be flawed at best, often times we'll stop by the local Bass Pro or Gander and just quietly listen to the nonsense the firearm employees are downloading on the customers, pretty funny, like being at the circus!
No, I'm not saying ALL employees of these fine establishments firearm departments are full of it, some are quite knowledgeable, but then again, some are full of it!
Plug the sight base holes, after a few seasons of dirt and water residing in the holes, rust will rear its ugly head, you know, rust never sleeps!
Try this....
...........www.brownells.com/.aspx/pid=792/Product/PLUG_SCREW_KIT
Thanks for the great advice, I absolutely agree with you about rust. After snooping around, I learned that the size is 6-48 screws, midway pack of ten can be found here.