What CRM/Marketing service is great for small B2B SaaS Bootstrappers?

I'm at a point where spreadsheets and one off emails are not viable anymore. So I'm searching for an easy to user cost effective CRM/Marketing system that can do the following:

B2B Focused

CRM - Handle Companies & people who work for them
Pipeline - to track those people in the CRM - lead, ongoing sales, sold, remarket to, dead etc, followup reminders, next stage/action etc
Marketing - Email marketing campaigns - new lead, remarket, come back, onboarding etc
- Would be great to have FB/IG ad integration/control too for marketing
Calls - Some kind of link/or built in phone call system to make dealing with pipeline tracking/actions easy.
Integration - well supported integrations with other services if need be.

Currently I have about 500 leads to track, expect it to grow to about 5000 over time.

I'm a non-tech with a MVP launched and some clients using it. It is build with Ruby on Rails as a backend.

Currently using Crisp.chat for in-app support & Helpdesk articles. I just setup the email section to be able to email to users too. But I don't think it's going to handle leads too well from what I can tell.

So what have you guys used out there that you love and is not big money (or becomes big money after a few months or one year?

Options on the radar from initial research:
Outseta (looks good, but not sure yet)
HubSpot (so confusing, so many options, prices, plans etc, but is a big player in this space so it seems well supported)
Salesforce (they seem to have some new plans for small businesses)
Close (looks interesting, their phone thing looks neat, but it's pay per minute)

Who else to look at?

I've added a card to the IndieStack Bible Trello board, so you can vote, add your comments about services, or add the service you use there too: https://trello.com/b/1gQarTJs/indiestack-bible