Not the best triangulation but it'll work fine, especially if you move the speakers away from the walls a good bit. That's something you really need to do with Paradigm Prestige, B&W CM or KEF R speakers as they're all rear ported.
Will you be getting a pair of mains as the foundation for a surround system or are you a 2.1 music oriented person? Where are you located and can you get out to look and listen to any of these? Others that some to mind are Monitor Audio, Revel, Salk, PSB, Golden Ear and Martin Logan, just to name a few. There are some really good speakers out there. What's the budget?