Moto 'Droids' also tend to have a locked BIOS or something that prevents ROM builds from being flashed somehow. they're not exactly future proof, they are more like locked down un-jailbroken iDevices in that respect.
Samsung Galaxy Precedent (rooted, AreaRom 3.4 , sd-ext w/ 3.65GB internal space)
Kindle Fire (1st Gen, rooted, AOKP JB 4.1, Nova Launcher)
Samsung Galaxy SIII 4G LTE (rooted, Carbon ROM)