I've always been a BM fan, and the mini-Grip has always been my favorite knife. When I lost my mini-Grip, I went to a local sportsman's store to handle some Spydercos. Despite hating the looks of them, (IMO the only real slight against them), handling a few really showed me how everyone that says they're "form over function" was exactly right. I walked out having my mind completely changed on the matter, and the Native was by far my favorite model.
For a 3" blade from Spyderco, the Native is a great buy if you're in the market for s30v and don't mind doing without the AXIS lock. I think it's one of the highest-value folders out there. The ergos in my medium-sized hands were outstanding, especially the choil thumb-well that allows a great grip for more precise control. The lockback mechanism also surprised me with how smooth and easy it was to operate, the best I've ever felt. The Native is very light, and as a direct comparison my 556 Mini-Grip did feel like a more solid and well-built knife, though that's more of a mark in BM's favor than against the Native. FF is just something BM puts more into, whereas Spyderco burns the midnight oil on excellence in design and finding the best materials without as many "bells and whistles". A mini-Grip will give you more blade, a thicker more substantial grip, and the superb AXIS lock, but at the price of edge retention and a hair more weight. The gap for both of these is small, however, as the 154CM is excellent from BM, and easier to sharpen than the Spydie s30v, and the difference of weight is only a few grams.
In the end, I say you couldn't go wrong with a BM mini-grip or a Native FRN. They're both great knives, and if you can't handle them yourself before buying, I say simply pick whichever one you prefer the looks of. I have no experience with the 530, though it doesn't look as functional as an EDC.
If you can up the price-range to ~$125, consider a mini-RSK in s30v, modeled after the mini-grip, or a Sage3 or Native5 from Spyderco. The first because it is basically an optimized version of a mini-Grip, the second for the Axis-like lock in a small Spyderco in s30v, and the third for the updated design and the slightly easier to sharpen and tougher s35vn steel.