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I'll have a look back for the main one I used and had success with. They offered delivery reports, raw data sending etc I never had any trouble with SLA when I was using them for sending out ringtones. Will see if I can find the provider I used. It would have been British.

Cool, thank you very much for looking!

I'd be very interested too... I've been looking for a while..

I work with a mobile marketing company that uses OpenMarket as their SMS hub, and I have been quite pleased with them so far. They provide a consistent API and callback feature for sms that bridges over to the mobile networks.

http://www.clickatell.com has worked fine for us. Not sure if they offer SLAs, just a datapoint.