The bets thing to do is do a +Search for one. What one person will say is good another will have bad experiences with. On forums that discuss shell provider quality it is an endless debate over which are good and bad.
The good one will be the one that serves you well and provides what you need all of the time.
ShellHelp - might want to check out this site, it is a shell information site, search based on needs, provides reviews of shell companies, and user comments, etc..