Make sure you want a flipper before you buy one. If you do, that's fine.
The high end in quality of your list, excluding custom, is the small Sebenza, blade-length about 2.97". Make sure it fits your hand. I had one and traded it for a large Sebenza, which I'm happy with. Also, a larger handle and the blade-length is 3.625".
In ZT, I liked the 0550, (5.8 oz), which is a non-flipper but very smooth and very popular. But these are large knives. The 560 is even larger.
The Strider Sng is much the same size as the large Sebenza, in handle and blade-length. The PT is very small, similar to the small Sebenza with a 2 3/4" blade.
These knives that you've listed can be classed as either very large or very small. Handle some at shops; make sure you know what size you want.
I would advise you to stay away, for now, from any knives that are meant for severe heavy-duty use, with thick blades. They are heavy, are useless for casual EDC and you will leave it at home because it's too heavy. Ask me how I know.
Some of the very best folders out there, with 3 1/2" blade (approx) weigh less than 5 oz and you will carry it with pride. Choose carefully; it's costs money to make a mistake. I've made lots of those also.
Sonnydaze