I work on an esri heavy team, i'm looking for a mapping engine that will give me flexibility to build on top of and leverage only the pieces I need and or add more as the app grows. I've been using ESRI's API to great success for my indiviual code but leveraging their codebase into a reusable solution grows too large for my liking.

I've started on leaflet, and have began testing on esri-leaflet to some success, dynamic layers are drawing slowly, but we are currently upgrading to 10.1 so that may wash out. If anyone has an other mapping engines they like or have used that would play well with ESRI I'm all ears.

Thx