Wanting to choose a VPS for vB4 (maybe vB5 later on) but dunno which
 

I've been thinking of getting another vB4 license, but the problem is that I don't know which VPS hosting to choose..

What I know is that the site will be popular, with an estimated user base between 50 to 1000 users daily (not accurate) with quite a few posts daily as well. It might become more popular later on. The problem is... What VPS should I choose? How many RAM? How many cores (CPU). And should I do it managed, or unmanaged?

I assume even if I would choose unmanaged, I can easily install my own Control Panel.

Help is appreciated.