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I would also choose the delica for myself, but my advice would be try to find a local store that had both so you can see which feels better in your hand and pocket (most of the large chain outdoor stores should cattery both models)
Wow. The overwhelming majority of people here are recommending the Delica. I am kind of more towards to the Buck Vantage Pro... tough choices.
I have a ton of more expensive knives and my delica still gets pocket time.
Most of the people in General are Spyderco fanatics (AKA "fans") who think a blade by virtually any other company is garbage. Get the one that fits your needs and budget. Of those you listed, I'd go with the Buck, simply because I've never gotten a lemon from Buck, and they have one of the best - if not the best warranty in the business.
Oh are you in LA? I just moved here and don't know where to go yet for good in-store stock. You aren't allowed to post stores that are not supporters of this site, but could you send me a message/email?