First off welcome to the knife world and secondly start saving your money because this qickly becomes a sickness moving from Kershaw to custom blades in no time. You cannot go wrong with the 583 barrage and should be able to score one around 100 bucks or less if you are patient. However the 581 is more than worth the upgrade and can be had for the $130-$140 range if you wait and watch. (CPM154-M390 UPGRADE). Wesson Ace Hardware online is a great place for Benchmades when they have them in stock. The Axis lock is the best locking system out there. However, I prefer the Zero Tolerance newer designs over most Benchmade designs. Bigger blades and fill your hand better. Not a fan of the 0350, 0550 or 0560. Inherently have had a lot of issues, read the reviews carefully. However, now that they have their act together I agree with others here the 0556 is going to be an excellent option. I have the 0801 which is awesome, Elmax steel at 3.5". All Titanium but $180. The 0770 out soon as well in carbon fiber same price 3.25". I started in your price range, sold most of those and learned that my best range for keepers was the $150 to $250 range. Now I am moving to customs so what do I know. (DOWN WITH THE SICKNESS!)
Remember this, for the most part steel is steel and you can add super steel to the name and it is still just steel. Unless you are an extreme hard user, prone to getting wet, you do not have to worry about the steel. For the most part any reputable knife maker is going to use an excellent steel. The difference maker is how they heat treat the steel prior to use. Yes you can upgrade to a so called better steel but do not be taken advantage of just because of the steel. Do your home work before you buy anything.