The 710 is great, but I would recommend against D2, unless you get a coated version. I have had some problems with corrosion on uncoated D2 Benchmades, even with diligent oiling. A 710 is also much bigger than the Caly 3 or the Ritter Grip- it has a 4" blade.
There are a lot of good folders to be had for less than $125. The Yojimbo is a great choice for a 3" blade, if you can find one. The Tasman Salt is another excellent knife in that size category, and you can get 2 for that price. Another great choice would be the Benchmade 940. It's a superb knife, light and elegant, with the smoothest Axis lock out there.