For startups, I would recommend Agile CRM as it is an All-In-One CRM software which takes care of your marketing, sales and service automation.
Agile CRM offers sales enablement tools to achieve your sales goals by providing a 360-degree contact view of your client and gathers their data under one platform. With the help of Agile CRM's marketing automation, you can create automated email marketing campaigns, landing pages, video emails, web forms, web popups, etc.
Agile CRM also offers service automation tools which enable helpdesk automation, support campaigns, customer support, etc.
Agile CRM is a very economical software for small and medium-size businesses and you can also try it for free with 1000 contacts, (up to 10 users) before making an actual purchase.
Let me know if you need a demo scheduled with one of their product managers.