I've worked with a couple of CRMs; if you are looking for a custom-like solution, I'd recommend Podio.

Salesforce has a lot of options, but tends to overwhelm folks who are not familiar with their tool.

If I didn't go with Podio, I'd choose HubSpot because of the integration with their other sales and marketing services. I don't know any other details about your venture, so it is hard to offer a tool that will grow with you.

I'm happy to discuss more and give you a more detailed answer. Just book a call and we can get rockin'
-Shaun