There a lot of Benchmades and Spydercos to look in that price range. I own several Benchmades, only 2 Spydercos, a Spyderfly and a Fred Perrin. The Fred Perrin is a great fixed blade, and I would totally reccomend it.
However in the folder department, based on what I've seen I would reccomend Benchmade. The only Spyderco folder besides the Sypderfly I've ever handled was a Native, and it was insanely dull. That probably was not Spyderco's fault, however, as it was from a mall store. (my Spyderfly and Perrin were much butter in the sharpness department) The good point was that the lockback on that thing was the best one I've ever seen, no blade play at all, strong, but still easy to disengage. Unfortunatly nothing exactly blew me away about the native, so I didn't get it. (plus it was way overpriced).
All the Benchmades I have handled pleased me a lot more, in terms of grip, asthetics, and cutting. However, all the Benchmades are also a lot more expensive than the Native, so that may be a moot point.
As far as sharpness goes, I'd say it's a tie. The Benchmade's I own except for the 630 came sort of dull, (nothing that couldn't be fixed on the sharpmaker however). The Fred Perrin was a little sharper, but not shaving or anything. The Spyderfly was very sharp on the front half of the blade, but that was ruined by the fact that near the handle the edge bevel didn't actually meet, and I had to remove a lot of steel to change it from \_/ to \/. Note: all these blades came with angles over 40 degrees, which the sharpmaker is set on. It's not hard to sharpen them, however, at slightly over 20 degrees per side. The fact is, all factory knives I've ever seen came like this, except for my two Bucks. If your'e looking for NIB sharpness, in my experience nothing beats Buck knives, the 110 and 560 I have both shaved hair easily when I got them, and have edge angles less than 20 degrees per side.
Oh, also, it may not be what you had in mind, but get a balisong. Everyone needs one, and you can choose between a Benchmade 4x series of a Spyderfly. Just keep in mind that the Benchmades are slim and light, while the Spydefly is huge and heavy. The spyderfly comes with a pocket clip too.
Bottom line is, you will be happy with either a Spyderco or a Benchmade