I see you live in Ga. What kind of depth have you been getting with your detector and 950 coil???
I used to run a V3i--no experience with the 13 ultimate----did have the 10x12 sef and liked it. Most folks I've seen comment on the 13 ultimate on the V series seem to like them. I was never a fan of the 10dd coil. That's one I highly recommend you stay away from---IMO mounts are wrong place (rear) causing detector to go out a balance, and noisier than my 10x12 was. Plus there are many other folks Who have had similar/same experiences as I have with the 10dd coil.