In addition to the eight basemaps, there are six basemap label layers,
ShadedReliefLabels, to compliment the basemaps. If that is not enough, there is also a retina version of each basemap.
To use an ESRI basemap, follow these steps:
<script src="http://cdn-geoweb.s3.amazonaws.com/esri- leaflet/0.0.1-beta.5/esri-Leaflet"></script>
On its GitHub repository, ESRI states that the library is on track to be moved from beta to production in 2014. You can find more information and download the additional files at https://github.com/Esri/esri-leaflet/.
Next, create an ESRI basemap layer...