Need help choosing setup for VPS

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Hi,

I have been using Concrete5 for a couple of months now working on a customers website. Now I am thinking of writing my own website, using Concrete5 (as a Struts/Spring- and PHP-developer I am totally amazed how easy it is to create simple websites using Concrete5), and probably starting some other web projects in the near future.

I have a couple of issues I am trying to resolve, but I just realized that I need some help from the c5 community.

First. If I want to write, lets say, three different sites. Is it possible to have different Themes and Page types etc for each site within the same Concrete5 instance? Or is this setup impossible?

Second. Either way, I just found out that I have a quota of about 32Mb RAM, which might explain why my c5 Dashboard takes about 20 seconds to load a page. So now I am looking at Cloud VPS and trying to find a setup that will fulfill my requirements. But, I don't really know exactly which my requirements are. Of what "I have heard" one c5 instance has a footprint of about 100Mb. Is is true? It sounds quite large? Is this with the caching, or do I have to recalculate this with a cache-size estimate?
So, if it is not possible to run multiple sites within the same c5 instance, then for each site I want to run/host (in parallell) I need about 100Mb of RAM. For three sites (my customers site, my own site, and an experimental sandbox site) I would need 3x100Mb of RAM at least. Lets say about 400Mb for the c5 instances.
How much additional RAM will I need for running Apache and MySQL?

Today I have to potential VPS-providers I am choosing between. GleSys and Ipeer (mostly since they have servers in Sweden). On ipeer I can get 1Gb RAM, 1000Gb transfer, 1 (or 2) core processors, 10Gb storage, for about $25 a month. To upgrade from this I will need to pay about twice as much, which is over my budget.
The corresponding setup with GleSys will cost more. But it is cheaper to extend with more RAM etc.
So what do you think, is 1Gb RAM minimum for running three c5 sites, or could I go lower on the RAM and then extend?

I would highly appreciate any feedback on this post.