I am still trying to figure out why I thought that service oriented architecture and object oriented architecture were two animals that couldn’t live together. Anyway, my misconception was solved.
We have agreed upon the architecture that we will follow. As usual, we based most of our decision in the book “Patterns of Enterprise Application Architecture” by Martin Flowler. It has been my architectural bible for many years already. Thank you Martin! We love you!
We have also decided to split the Merrcury Engine into subsystems that will communicate to each other via web services. Although the benefit of this architecture is not going to be visible in the short term, we are sure it will help us in the future as we grow… and grow… and grow… 
Alex
Alexander is LetMeGo's co-founder and jefe. Here is his LetMeGo 