Other than Motta, I would recommend Rattleware on the low end. They're cheaper than and not as nice as motta pitchers, but they are straight-sided (i.e., more typical shape) and have a somewhat better-shaped spout (bit sharper) and finish than, say, Update International and other similar brands on the low end, in my experience.

On the high end, Alessi is king. I splurged on one of their 8 oz. pitchers some time ago (for macchiatos and short cappuccinos). The quality of the finish is utterly unrivaled; it blows Motta pitchers out of the water: heavier, curvier, fits nicer in your hand... and sucks a lot more out of your wallet. It has a very pronounced spout, though, and can exaggerate your latté art if you're used to using a Motta or standard straight-sided pitcher. You have to get used to this and change your technique if you go this route.

I agree with Dan on sizing: 12 oz. is the best go-to size, letting you do cappuccinos and modestly-sized lattés pretty easily, and if you plan on making large lattés or doing a pair of cappuccinos, a 20 oz. pitcher is likely preferable. I'd add If you want to do macchiatos without wasting much milk, an 8 oz. pitcher can help significantly: pitchers are much harder to work with in terms of getting the best milk texture when you don't fill them up sufficiently (or you over-fill them).