Need Advice: Very Reliable Email, IMAP, Storage, Small B2b Business

I'm looking for quality hosting at the right price for a small business. I have been searching these forums, but just got no conclusion, and would appreciate any advice concerning 'features' and 'providers' that I shall look at or avoid.

My needs are:

- very reliable email, with IMAP, good spam filtering, and ability to handle Challenge Response type system;

- rSync and storage of company internal documents (intranet like);

- host a small static website of a small b2b company, with little but valuable traffic;

- handle multiple (non limited) addon domains;

- for the near future: mysql, Ruby on Rails (need to explore it), Python and a good Content Management System;

- good stats tracking tools -- ability to log a list of sessions would be great;

- control panel doesn't matter, ssh would be nice;

- datacenter location doesn't matter too much, connectivity, reliability, and uptime do;

- 5~10GB storage mainly email and internal docs;

- 1GB traffic mainly email;

- preferably with a community forum - I trust more on those who have it, and have nothing to hide;

Do you think I can get something reliable for under $10/month or $100/year ?

I have found these options:

GeekStorage - looks great, LiteSpeed is appealing, people behind it look experienced, I was almost signing for it when I was caught by several issues with long downtimes (over 24h) during the last 2 months;

MediaLayer - also offers LiteSpeed, good comments by many on here, but no listed prices - why hidding the prices? are they trying to screw our bucks? that doesn't sound good to me;

HostGator and LunarPages - very popular, but they don't seem the thing for me, maybe for those with blogs, forums, or GoogleAds oriented websites, I get puzzled how can they offer 600GB for $7.95/month !?

FusedNetwork, Steadfast, DowntownHost and many others - seem to be oriented to lower storage and higher traffic, the opposite of my case.

I know I can get dedicated storage services, but a large amount of my storage need is for email which need to be synchronized through IMAP. BTW, can IMAP be used to synchronize files beyond messages?