I can advise you to compare all web hosting services, as it is a top priority for your new web host business to be well-provided with all necessary tools.
I've been with Cloudarion.com for about 9 months now. Server uptime is good, tech support is good.
Easy upgrades to VPS option from shared hosting (just a checkbox). Support is good & fast except that they don't have livechat or skype support.