We use APG out of Castle Rock, CO, USA. Absolutely excellent, service is done on-line or thru Blackberry link, they can fax it and, if you subscribe to ARINC Flight Planning service, it is on their website. Analysis is done virtually immediately, in my experience over two years. Special procedures are included, if needed. They are used by charter operators, airlines and corporate flight departments.
PM, me if I can be of assistance
GF
Danny does NOT endorse this or any other product.
To be consistent, I have removed the APG link. However, Mr Google can provide it (in an instant) for those who may be interested. - JT