Sold! And my LGS has both 2.5 and 7.5 in stock. (and a range) I'm off to try both, and will report back. Thanks ZZT!!
***Update: Went with the Leupold DPP 2.5 moa. I talked to Leupold on the phone and they were saying the 7.5 would be better for anything other than bullseye or rifle applications. I went to try the dots out with this in mind, and leaning that way.
Numbers are numbers (moa), but seeing is seeing. The 2.5 seemed bigger than similar size dots I have on other guns; especially when turned up brighter (as zzt suggested) than normal or what I'm used to. The 7.5 delta shape also seemed bigger than expected, and when turned bright, lost it's shape. Unless the delta was right in the center of the glass, it elongated and seemed to change shapes as I moved it. This of course could be in part by my eyesight--but it's me who's going to be using it. I could see how shooting while completely still there could be an advantage there, but not for my application. I hope the 2.5 turned bright will work for me in SC.
To my surprise, there was no pic mount with the dot. I knew they have a plethora of base mounts for slides, but thought it came with a generic one for a rail. The store did not have one for my 22/45; I ran to Cabelas, also no joy. Leupold does make the universal rail mount, but if I have to order online, figured I'd look for a direct screw on plate or dovetail.