You will want to put V rated tires on to match the characteristics of your other two tires.
Yes, you can rotate. Just keep the tires paired on the front or rear as stated above.
What's important to you? There are many considerations:
Handling
Tire wear/thread life
All season (wet, snow, dry traction)
Wet and dry traction
Dry traction only
Price
Handling
I've found that searching the TireRack works really great. You can check out all of those parameters and more VERY easily.
Here's a link to a search that I've already got your size entered into. Just choose the rest of the options and get the results.
http://www.tirerack.com/tires/Search...er=16&x=18&y=8
I hope that helps. If you have any questions based on what you find just post.