What is a reasonable CPU mem allocation?

I recently installed Typo3 CMS to try it out (what a pain!), and the initial configuration panel indicated that I only had 15 megs of RAM available to me, that I should talk to my server's admin, and that I should have a minimum of 25. I am on a shared hosting package. This got me thinking about what would be a reasonable RAM allocation nowadays? I thought 15 megs was a tad too low? And, does this indicate high use of resources, and so a crowded server?
Any thoughts and suggestions (whether I should move, perhaps? What is a reasonable CPU mem allocation? would be most welcome
Thanks

 

 

 

 

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