Ask HN: Salesforce/Highrise/etc., what works for you?

We're growing our customer base and are increasing the amount of incoming leads that we can't deal with it by ourselves without the help of some technology. So we're hoping you can provide us with some info: 1) Which CRM are you using? 2) Why did you choose it? 3) Any problems you are having? We are a SaaS company that sells one product in a 3-tiered pricing strategy. We don't have a sales team at the moment, but will be building one out. Thanks!