I like swan secure square drives. How many pounds do you need? I buy them 4,000 at a time, which is a 25lb "box" but weight varies with the length. A thousand count runs around 79 dollars before tax, and 4000 runs around 285 before tax.
With soft woods and plywoods you don't have to pre-drill until you get to the 3 inch lengths.
The other thing, that helps a lot is to buy good bits. The best ones are wood workers supply's hardened bit drivers. Though you can make it through with hardware store stuff, just realize they are worn out after the first 100 or so. If the edges aren't sharp, or there is a wear line at the tip edge where it grabs the square drive the life of that bit is almost through...
Swan secure also makes some neat #1 headed 7 bar trim finish screws that are 3/4, 1 1/8 or 1 1/2 long. While not quite a brad nail, they disappear a lot easier on trim that is to be painted, than counter sinking a #2 head.
You can get them through builders supply companies that deal with decking guys.
Stainless square drives, get used in boat construction, as "hatteras screws" as the hatteras boats were the first ones to switch from tapered wood screws for interior joinery to the stainless square drives.
Zach