In terms of security and speed, the two 'premium' VPNs are IVPN and VikingVPN. Viking also offers fantastic customer support, but my only gripe is that they don't run their own DNS servers (they use Cisco's OpenDNS). They also don't offer any exit nodes in Canada, but the company head (Derek) says it's because Viking is worried about Canada's data retention laws.

Likewise, I'm not affiliated with IVPN nor VikingVPN in any way. I think both are great choices.