I think the best non nexus oem would probably be Asus, but they mostly only make wifi tablets and the only two phones they made are unlocked gsm phones. In the us, it doesn't matter how fast the oem is because the carriers slow them down.
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Current Devices: Nexus 5, HP 14 Chromebook (Data Enabled), Google Glass, (2013) LTE Nexus 7, Logitech Revue, Chromecast
Retired: Samsung Fascinate, Droid Charge, Galaxy Nexus, (2012) WiFi Nexus 7, Asus TF700, Nexus 4