I can sincerely recommend Javier Herrera of www.andeanface.com
or any of his guides. I met Javier in January 2006, he helped me and my friends to arrange all logistics for our Ecuador trip. In three weeks we climbed 5 peaks, including Cotopaxi and Chimborazo, and travelled extensively all over the country. Javier knows every corner there and he always had the best recommendations where to stay, eat or party, those kinds of advises that you will never find in guidebooks. Thanks to him we had a possibility to get to know a lot about this diverse country and its people. Also, he is a very nice person, intelligent and friendly, very professional and experienced climber, and certainly a great partner for your Ecuador climbs.
By the way, whole mountaineering community in Ecuador is amazing - many of their guides speak fluent English, all of them are educated, well trained and strong climbers and I made quite a few friends there. Get in touch with Javier and in case he is not available himself, he will definately recommend you the best guide for your needs.