Avactis development

We need customization from someone familiar with Avactis 2.1 Shopping Cart. We are a small retailer, with an existing website ([login to view URL]) who wants to start selling online, and have come across Avactis as one of our options. We are interested is doing an implementation in stages. For Stage 1 we want to do simple online ordering that we can implement within 3-4 weeks, without any extra bells and whistles. We would like to do grid order pages like [login to view URL] that we could add to our website (Avactis Mini Cart??). We then plan to expand capabilities with Stage 2, within 2 months after Stage 1. We have some specific Shipping requirements that need to be met, that we did not see available in our review of their User Manual: • We need to offer same day shipping by our own truck (within Manhattan, New York City zip codes). • We need them to be able to select delivery date (same day, or later date). • We need to have them be able to choose their delivery time (2 choices), based on their zip code. • We need to offer flat rate shipping charges by zip code (within New York City). There will be 2 rates: 99¢, and $2.00, depending on zip code. We also need to have a minimum $ for their order to be accepted. (Our minimum delivery order is $32.00, before sales tax). Please let me know if this Stage 1, with the Shipping requirements, and Minimum $ order, is doable, and which of it is a custom mod. What do you think, cost-wise and time-wise, would be involved? Thank you. I would appreciate a quick reply, as we are trying to make a GO / NO GO decision within the next few days. Also, our existing website was done in tables. We need to change to CMS that will allow our own updating, either through Avactis CMS or Drupal. What would you suggest? Cost?