Are the following worth getting "Slabbed"

I have never been much on coins from outside the US but with gold above $900 and acting as if this is just a "stopping off point" before heading to $1000 and beyond I have 17 British Sovereigns I purchased years ago for $75 each. At the time this was about "melt". My question is, sending these in to NGC will cost $25 each which is a fair chunk of change. If anyone has any info as what would be the best route to take, I sure could use the help. I was told by a dealer friend that a few were a little better dates and mints than most. They are what appear to be in various states of unc and at the very least high AU. The mints are a mixture of the following: London, Melbourne, Sydney and Perth. They also consist of the following "heads": Jubilee head, Veiled head and George V head. The dates, mints, and heads are the following: #2 1889 Jub.head London #1 1889 Jub.head Melbourne #1 1893 Veil.head London #1 1893 Veil.head Melbourne #1 1894 Veil.head London #1 1894 Veil.head Melbourne #1 1895 Veil.head London #2 1897 Veil.head Melbourne #1 1899 George V Sydney #1 1911 George V Sydney #1 1913 George V London #1 1914 George V Melbourne #1 1915 George V London #1 1917 George V Perth and #1 1925 George V London. I am hoping that some of you could tell me if I am just as well to leave them "raw" or go the slab route? My latest submission to NGC was mailed on the 5th and received on the 7th and still stuck in the received status. When I get these back it will complete my proof Silver Eagle collection. I can hardly wait! Thanks for any help you can give! Happy Collecting! WKF