[UPHPU] Virtual server requirements

[jtaber]

thanks to all for the comments on dedicated vs managed servers - it gave
me a lot of information.  I think our most economical / practical
option for now is a virtual server - moving to dedicated/managed as our
business grows.  One thing I noticed on virtual servers is the amount of
memory ranging from 100mb - 512mb.
For an apache 2.x, postgresql, php5 server is there a base amount we
need, especially at an early (small volume) stage ?