If you shop around on ebay, you can find a Spyderco Kiwi within your budget. I think it's one of the very best, most friendly (almost cute in fact), choices for an office knife. I do love mine!
Next to that one, the Fallkniven U2 is remarkable and humble-looking as well.
Both are my two most carried knives, indeed in an office environment.
Spyderco Kiwi:
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That would make an excellent office knife! I have a number of smaller case slipjoints that I take to work. I doubt their tiny muscrat would scare anyone and the little wharncliffe blade is great for opening packages.