For a second Spyder (which will quickly turn into your third, fourth, and so on...
), I would recommend--in no particular order--the Delica, Dragonfly2, Sage 1 or 2, Paramilitary2, Native5 in S90V or S110V, Manix2, Endura, or Caly 3 or 3.5. These are just a few of the popular models out now that most folks seem to enjoy. If money is no object, I'd also suggest the Slysz Bowie, Gayle Bradley Folder (version 2 is nearly here!), or Southard.
What are your primary uses for a knife? Any blade length limits?
I've heard lots of great things about the Paramilitary 2, and from a few quick searches have found that the popular color options are very often sold out. Primary uses include mail & box opening, although having something more capable than a letter opener is always to be desired. My current list of knives (in the order I got them) are:
Kershaw Scallion (1620 RDSO) - Plain edge
Kershaw Shallot - SS handle, Plain edge - http://kershaw.kaiusaltd.com/knives/knife/shallot
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Kershaw Scrambler - Plain edge
Kershaw Funxion EMT
Spyderco Starmate (C55G)
The Scallion is the first "good" knife I've ever owned, and it was a gift from my father. I still carry it sometimes. It's a shorter knife, only 2.5", but it doesn't have that "scary" factor that longer knives have so it's nice to have when I'm at the office.
The Shallot was my first knife purchase, and I fell in love with that knife. I love Kershaw's SpeedSafe open assist feature, though it does add to that "scare factor". Unfortunately I lost that knife last summer and it bugs the crap out of me. The 3.5" length seems just a bit too long for that style of knife, but I enjoyed it immensely. Something about that stainless steel felt really good.
To replace the Shallot I purchased the Scrambler, but that left something to be desired. It's bulky in hand and slow. The reason I was drawn to it in the first place is the blade shape. I really like the classic look of a drop point. Reminds me of the old folder my dad carried with him.
The Funxion EMT was originally intended as a gift to my brother, an EMT. Apparently he isn't very fond of carrying a purpose driven knife though, he just likes his cheapo $10 plastic handle Stihl folder. So after sitting in the junk drawer for a year I "inherited" it back for myself haha.
That brings me to this latest purchase, and my introduction to the Spyderco family, the Starmate. Great knife. Really like it. I guess what I would REALLY like for my next spyder, is basically this knife but .5" to .75" shorter. The only limitations I have legally is that it can't be an auto, which is probably a given since I think that's a federal law(?). I can open carry knives larger than 3", and conceal carry basically anything else.
Essentially, I'm still very new to the scene, and I feel like a kid in a candy store right now haha.