welcome to the forums! what knife to consider? I bought my first blades without venturing onto the forums and paid full msrp for them! I was conned!!! now that I'm a little wiser, here're some suggestions:
(1) spyderco delica or endura - they're only about $45 on the discount online shops. they offer one of the best stainless steels (VG10), are of a good size - about 3" and 4" respectively, and have good solid lockup due to the lockback design. The downside is that their design may not appeal to all (personally I love the shape and size of the Delica best!
(2) crkt knives - cheaper but the steel used is not as good as spyderco, dollar for dollar. You can consider getting a crkt apache (ATS34 steel - good ****!) over ebay for less than $40 - definitely worth it. However, you may not be able to find plain edge versions. Other crkt to consider would be the M15/16, Crawford/Kasper;
(3) benchmade griptillian ($50ish) or linerlock AFCK ($70ish);
(4) SOG x-ray vision - $70ish, with ATS34 steel, arc-lock (damn good!) and good ergonomics;
(5) timberline wortac - $50 with AUS8 steel, teflon washers and good, altho' somewhat bulky ergonomics.
This forum is the best place for suggestions....and I'm sure the other more experienced members will chip in with their suggestions.