kgphoto,
I am just learning as I go here, so I am probably not the best person to provide an opinion. I have seen others comment that 14" was a good size.
In terms of a reflector, yes, 14" does seem small to me. I have other reflectors (see below), though, so my target's size doesn't worry me too much.
http://www.bhphotovideo.com/c/produc...lver_Gold.html
http://www.adorama.com/LSTGRGW.html?...grgw&item_no=1
I suspect RFS will provide some of his thoughts on the best sizes for the Photovision target.
Regards,
Kevin