As you can see, dclagg1, there is going to be a wide range of responses to your question. Each person's needs for daily carry will be different.
I like medium-sized knives in about the 3 1/2" to 3 3/4" closed length range, but I may go a little above or below that range on occasion. I prefer 2 or 3 blades. I like Case's chrome vanadium (CV) carbon steel, but their Tru-Sharp stainless steel works well for me too. Choice of handle material is a personal preference thing, too. I prefer, in order: jigged bone, smooth Yellow Delrin, smooth bone, older style (70s-80s) jigged brown Delrin. I generally don't like stag, wood, or modern jigged Delrin.
Those may seem like very specific preferences, but that still leaves me a ton of choices to pick through. And to be honest, pretty much any one of them will do, if you just pick it and decide "ok, this is my pocket knife".
I've been carrying the Small Texas Jack (62032) in Amber Bone with CV steel every day this month:
Here's the same knife handle, but in the Medium Stockman (63032) in Chestnut Bone CV:
or the Mini-Trapper (6207) in Chestnut Bone CV.
Hard to tell from the pics but those are all generally the same size.