I use Federal Speek Shok's, and have been for the last 3 or 4 seasons. 3.5" going 1550 fps, 1 3/8 oz load. I get them for around $13-$15 per box, and I buy 2 cases of them before the start of the season.
They go fast.
They don't cost much.
The perform well and are reliable.
I could buy something better, but they are more than $15/box.