Welcome to the forum...and thank you for your service. 
Since space is at a premium IMO there really is no need to go overboard with your setup. If you find the perfect speaker system and it doesn't fit what good is it? Speakers need to breathe, even tiny ones. So I would suggest for now going with a micro/mini system such as the Athena Micra 6 system. You want something to expand the sound experience commensurate with your 40" LCD. But you likely would not want everything stuffed into a cramped space where decent SQ results would be tricky. Remember...it's not about the watts...it's more about the SQ for the budget.
As to receiver you be hard pressed to do better than the Pioneer 1015. Some will say grab a Panny XR Digital for less and that would also make a great deal of sense and be easier on the budget. Don't know about supply though. And a decent standalone speaker system and separate receiver will tap your budget fairly hard.
Lastly, if you are still considering it, have the Onk system delivered home and then reboxed into multiples and shipped out to you. That makes a lot of sense for your current suituation and the SQ will still be appreciable. Not as good as the other way but perfectly suited to a small space.
Since space is at a premium IMO there really is no need to go overboard with your setup. If you find the perfect speaker system and it doesn't fit what good is it? Speakers need to breathe, even tiny ones. So I would suggest for now going with a micro/mini system such as the Athena Micra 6 system. You want something to expand the sound experience commensurate with your 40" LCD. But you likely would not want everything stuffed into a cramped space where decent SQ results would be tricky. Remember...it's not about the watts...it's more about the SQ for the budget.
As to receiver you be hard pressed to do better than the Pioneer 1015. Some will say grab a Panny XR Digital for less and that would also make a great deal of sense and be easier on the budget. Don't know about supply though. And a decent standalone speaker system and separate receiver will tap your budget fairly hard.
Lastly, if you are still considering it, have the Onk system delivered home and then reboxed into multiples and shipped out to you. That makes a lot of sense for your current suituation and the SQ will still be appreciable. Not as good as the other way but perfectly suited to a small space.