I had the Pebble until they were absorbed and my watch just started having all kinds of issues. Replaced it with the Forerunner 630 (for a steal at $200).

While not really a smartwatch (its geared towards runners) it does what I want. Notifications, vibrating alarm, customizable faces, tracks my steps, tracks my sleeping.

And it can go at least 12 days off a charge if just doing the above (no GPS tracking). I charged at 30% so you could probably get another 4-5 days out of that 30%.