I was recently in this position, looked at a ton of options, and ultimately settled on the
craftsman 52 piece set. I think it's $200 regularly, but I got it for like $170. They regularly have all sorts of sales. I think the one I had was for 15% off. It looks like even now there is $30 off when you add it to the cart, plus a mail in rebate for a $10 sears card.
The trays are flimsy and weak, and the laser etching is a little hard to read on a few of them (but great on the rest), but no biggie. The trays just went into a toolbox drawer. You can't transport them in the trays, but they do keep the sockets organized and readable. They seem to be of fine quality and the set I got at least is USA made (IIRC, have to double check).
I was looking at a few other options, but in the end, I opted for this set because of how convenient the craftsman warranty is. As a homeowner, if I ever break an impact socket, 9 times out of 10 it will be while I'm at home, while sears is open, and I can easily replace the broken one. I didn't want to get a set that had a warranty that was inconvenient to use (ie mail in). Even though the reality is that I will probably never break one.
Anyway, if you're looking at craftsman impacts, this set seems to be the best value by far. Comes with the 3 extensions and universal, and a good range of sizes in both metric and standard.