Call Manager SIP trunk to SIPGate

morning all,
im new to this forum, and have been scouring the net to see if anyone can help. I have just set up a Cisco Call Manager cluster version 6 on VMWare here at home. the intention is to connect to some SIP Service provider so I can make and receive calls without the need to have PSTN here @ home. Question is:
1) Is SIPGate the best provider for this service - if so would you know how to set this up
2) would you know any other provider who does this, and recommend configurations for that also.

I am in the UK with a broadband connection of around 6 - 8mg.

Cheers all.