Any specific recommendation on Chat solutions integrated with Marketo?

Already looked at available solutions on Launchpoint. Also looked for available integrations with other solutions (such as Zendesk Chat). Basically, looking for a non-expensive tool that allows to create a new lead from a new use of the chat tool, and registers a summary of the conversation into a custom marketo field, that could then be synced to the CRM if needed. In a near future, it might also be required to create a path of custom fields to record all related conversations from a repeat visit lead, so the first conversation doesn't get overridden.

Any suggestions from anyone's experience?

Thanks