There isn't a good backup that isn't NANdroid. That is the only TRUE full backup. However, you can backup apps with Titanium or MyBackup Pro (my preferred).
If you see an advertisement for it, odds are good there are developers. Samsung, HTC, Motorola are the big ones. LG to a lesser degree. Think like a developer. You would want a great phone, not a throwaway $100 phone.
The Commandments of Android
1) Open RAM is wasted RAM - Don't use Task Killers
2) Cheap devices are cheap for a reason. Don't expect high end performance.
3) Boot Loop = Wipe.
4) There are no viruses for android.