If you want something tough and don't mind a bit of weight, here are some suggestions:
-Almost any Zero Tolerance. 0200 and 0350 are the more affordable ones. 0300, 0560, 0550 are excellent, too. Any of them will be a huge step up from your CRKT.
-Benchmade Adamas. Big and hefty, but practical and very smooth. I'm surprised by how the blade just glides open (I've got a few other AXIS BMs and this one is the smoothest).
-Cold Steel American Lawman, Voyager, Recon 1, Talwar, etc. Pretty much anything with a Tri-Ad lock. They are super tough, the steel is OK but nothing to write home about. If you want something really large, this is the brand to look at. Some of the XL models are relatively pocket friendly considering their size (like the XL Voyagers). I'm not too fond of the Spartan you mentioned, since the handle is too thick and it takes up too much pocket space, plus I'm not fond of bead blasted blades. If you want a big CS folder with the disk so you can use it as a wave, go for the Talwar XL.
Personally, I'd go for a ZT 0200. A great knife at a reasonable price.