In that price range you cannot go wrong with the Small Sebenza 21. You could even get the Insingo if you prefer the wharncliffe blade shape. Excellent fit and finish, top notch in every sense. And it's so simple and beautiful that it's hard for people to be afraid of even the large one.
For cheaper options in your price range, take a look at the Spyderco Gayle Bradley Air - It's lightweight, thin, slides right into the pocket or even the watch pocket, M4 super steel, beautiful Silver Twill scales with just enough grip, awesome ergos, great blade shape perfect for any task and just adds to the sleek look. And very nice milled titanium liners that you could even have colored blue if you wanted to give it a prettier custom look. Oh and it only weighs 1.27oz. Can't even tell it's there but it can handle any office task no problem.
Also, take a look at the Spyderco Urban - I have the Wharncliffe. It's a slipit with no lock but you really don't need a lock. Especially for office and regular EDC use. Plus your finger on the choil and pressure towards the open position will keep it open. Although it locks(not really locks, but for lack of a better word) open nice and tight with no fear of it closing. Again the Wharncliffe blade just doesn't look scary and can make light of any task. I find this shape great for mail, packages, and carboard. Also little ties and anything else. It has a decent blade steel that holds its edge well and is easy to sharpen. It also only weighs 2oz. and comes with a deep carry clip. The Orange G-10 on the Wharncliffe is good for any drops if you need to spot it. And it's just a nice people friendly color.
If you don't want the Wharncliffe blade but want the Urban and the Orange handles, pick up the Leaf blade/Foliage Urban and the Wharncliffe/Orange and swap the blades and sell or trade the Wharncliffe/Foliage one. =]
Good luck with your hunt.