Event/Exhibition Organizers Management Software

hi gang[tm], I've been STFW for some kind of CRM package specifically geared at event/exhibition organizers. I'm not having any luck, there *seems* to be stuff out there but most of it's geared at single exhibitor/corporate entity event management as opposed to the organization of events where 100s of exhibitors need be approached, sold stand space to and manage - of those that do seem to what I'd like they are a bit vague on their website and don't give any pricing info (as usual price is a big issue :). I've looked at the possibilities of using Salesforce or SugarCRM but neither seem to have plugins/modules aimed at the specific requirements I have. Basically I want something to manage: 1. multiple expos/exhibitions 2. selling standspace 3. manage tickets/ticket campaigns 4. floorplan management/creation/etc 5. speaker/debate-panel management 6. exhibitor pack/documentation management 5. the usual invoicing/lead/crm stuff does anyone know of anything that comes remotely close? rgds, Jochem