Welcome to the addiction!
In that price range, you have quite a few options. The first names that spring to my mind are Spyderco and Benchmade. They both make high quality prodcuts that can easily fall under $200. What I would recommend would be to find a knife you want for around $150, then spend another $50 on the Spyderco Sharpmaker so you can keep the knife sharp.
Now, as far as style of knife, sky's the limit. Do you want a knife that looks fancy (which non-knife people tend to admire), or scary (which could perhaps draw more negative attention)? You want a bigger knife (4" blade or so) or a smaller one? You have any particular activities you engage in that might affect your choice? (e.g. Whitewater rafting, lots of camping, lots of carpentry, electrical work, saltwater exposure... etc) Would your workplace have a problem with a big and/or scary knife?
Serrated edges are very good at cutting rope, cordage, seatbelts, or other fibrous materials, hence their popularity in rescue and marine applications. I've carried both a Spyderco Delica and Benchmade AFCK in semi-serrated, and didn't use the serrations very often. I did find that while I had enough plain edge on the AFCK (3.9" blade) to do other tasks, I frequently wanted more plain edge on the Delica (2.75" blade)... so the size of the knife you choose might influence this choice as well as your intended uses.
I personally don't like autos. In addition to the legality issue (which I think is a big one for an EDC knife), they have more parts and are thus more likely to fail. I don't know how often (if at all) autos mis-fire and accidentally open in someone's pocket, but I'm sure that just once would be enough to mess up your day. IMHO, not worth it for the extra tenth of a second of opening time.
One thing you might also consider is that in NH, it's apparently legal to carry a fixed blade either open or concealed.
Hope this helps!
Edited to add:
rnr made an excellent suggestion: Do some online shopping to find some that look neat and then (especially if you've not owned a knife similar to the one you're wanting) find a bricks and mortar store where you can go in and fondle the selection. Some lives look super-nifty but end up not feeling right in your hand.