Just plan to get both a Benchmade and a Spyderco. You will find a need for each, if you buy them.They are both good knives but very, very different.
Also, there are much better Griptilians than the 551. I would recommend the one with a sheep's foot blade (I think it is a 550 or 555) over all other Griptilians except one. The Ritter Grip. I would have to say that,IMHO, it is the best Griptilian out there. The Ritter blade makes a better knife for slicing. Oh, before I forget, I have the 551 but I work in a medical office and the knife does not work well with dress clothes.
I have never owned a Delica. Just does not do anything for me. For just a few dollars more you could have a Manix 2. For a little less you get a Cat, Tenacious, etc.