All three are solid phones (with plenty of the "bells and whistles" you say you don't need).
Of the three, I'd go with the Samsung... although it's not clear which a900 model you're looking at. The a990? a90 is a typo, I think.
I'm trying to decide between these phones- Samsung sch-a90, Razor V3m, or lgvx8300. I'm don't need too many bells and whistles. I won't be using it for internet, but I would like one that can get a good signal with not a lot of drop outs(dont know if thats more the carrier than the phone). Any suggestions? Thanks for any help.