IMO the best bang-for-the-buck auto is a Microtech LUDT. Many colors, etc and nicely priced for a Microtech. Very quality and very solid option IMO. This coming from experience with many different brands, including about every OTF and auto from Microtech. On the OTF's, Its may fav, but I'd avoid that platform if I was going for an "all-in" for a single EDC option. If you gotta have only one OTF for EDC, look for a single action OTF (that requires manually pulling the charging handle down to retract the blade). MT HALO comes to mind, but its huge, big $$$, and has no pocket clip.
There's a couple of other production single-action OTF's readily available, one is Paragon. I'm not impressed with its general feel, but its the spring is WAY too wimpy IMO. However, it is a single action OTF made of good materials with good finish, etc. That said, I never carry mine. Protech has a single-action OTF also, but haven't handed any of them. Their other autos are great though.