You should let us know how much uniques you have on what type of site, since they will shut you down (all vitruals do so) when having a to big load. When you mail them (presale) they will tell there is no such limit. But trust me there always is...
If you got small sites go for virtual, if your load is pretty big try out vps and later maybe dedi? (see sig)
if you use my cookie you get extra diskspace for servage:
servage