I'm with Slayer on H335. Another great choice is BLC (2). There are others as George and Soundguy have stated. I shoot ARs, and use the H335 in the 55 grain class, and the BLC in the 62 and up class of bullets
Two things - $30 a pound for powder is high, but I don't think it will drop all that much in the future. Even after the current crazyness passes, the shops are kinda getting used to charge that much. Second, if the .223 is all you are loading for, you are in great shape. If you load for other calibers, you might want to hit the manuals and find a 'one size fits all UTILITY powder' and stock up on it. Just my two little pennies.....