Server Intellect shared hosting. I have had them for years with amazing service. They call it the Public Cloud.
My experience with shared hosting at Arvixe has been nothing short of horrendous, both for Windows and Linux hosting. I haven't had such poor service since I started out hosting at GoDaddy (which, to be fair, is even more dismal). Perhaps Arvixe's less economical plans get better attention and service, I don't know.
For my non-mojoportal sites, I run a monitor of my own downtime and re-starts and the number of re-starts per day is scary. I have a keep-alive that runs every 4 minutes so the down-time is not .net spinning back up. I really should put a mod on the couple of mojoportal sites I run there to do the same...
I have had three really poorly attended-to service failures, the last of which happened today. Neither LiveChat nor the ticketing system helped. As a matter of fact, someone was just clearing their ticket queue at the end of the day, tossed off a "well, everything looks fine" boilerplate response to me. I then looked at the server health blog and discovered there had been a serious RAM failure during the day and my server was getting emergency maintenance in the evening. Why I could spend more of my time and figure out the connection but they, whose job it is to do this, could not, is incomprehensible.
My prior issues were similar.
I am a freakish fan of Server Intellect shared hosting. I won't even post my affiliate link. Just try it. You will pay more there than Arvixe, but their technicians are top-notch and I have never, ever had a serious issue with their service. I even look forward to issues at night or on the weekends because they have the forethought to put their best people on when there are less folks available to help.
Sorry, just honestly have not been happy other than having some smaller invoices with Arvixe at all.