What is a good outdoor grout and primer(brand name please) I can use to lay tile on my screened porch?

Would like to start coming Monday. Already purchased frost resistent tile. Winters are rarely freezing cold. We may get one week of 50 degree temps here and there. Otherwise climate here is somewhat mild. This is also a screened porch so minimal rain water touches floor. I live in Norfolk Va if that helps?

also your opinion would be helpful: Do you believe a pebble mosaic rectangle medalion 3'x5 1/2' in a daimond geometric pattern on a screened porch floor would hurt my resale value or help it?

here's a link to actual image of how medallion looks
http://www.exbali.com/images/Prbble_mesh…

StrataStones Pebble Tile