Best one I've used is VyprVPN
without a doubt it has been VyprVPN for me in Australia. I've used and trialled a few and it leaves, for example HideMyAss in the dust. It's not cheap though but I have not been geo-blocked EVER. They give you a free trial and there's no messing around setting it up either. The interface is basic and sleek and unlike most other MAC VPN's it has locked me into the connection if it's has failed which has been on very rare occasions 🙂
with 6 VPN OPTIONS TOO play with and they are ALL VERY FAST
Chameleon, 256 encryption with no loss of speed, very nice
Open VPN 256 encrypt
Open VPN 160 encrypt
L2PT/IPsec 256 encrypt
PPTP 128 encrypt
VyprDNS which is new and I haven't tried it yet
It's works flawlessly on my MBP and iPhone 5s, I don't usually give companies glowing reports but these guys have done their homework and it rocks, with 24/7 support. If you're like me and don't want to set one up then check them out, free trail.