Being in England, you have access to some good british speakers like Mordaunt-Short, Mission, Monitor Audio to name a few. Like Seth said, the speakers are the real bottleneck of your system. If you need more information regarding what pros think of Bose speakers, go to any reputable forum like this one and search for Bose. You will hear the same thing everywhere. The good news is that Bose has a high resale value as so many believe them to be the best. Switch them out and you'll notice a world of difference.
Assuming you're US military, I will take a moment to say thank you for your service to our country.