Hosting

Hello. I would like to consult you about choosing a hosting service. You recommend http://it-patrol.ru. I am considering their fourth tariff plan. The website is expected to have 400-600 visits per day; what should I pay attention to when selecting a hosting service? Also, some hosting providers specify dedicated memory of 128 or 192 MB; how does this affect performance and how much is allocated on http://it-patrol.ru (if known)?