What would probably be one of your best values and certainly the most fun, would be to build two 8 foot tall line arrays with 3" drivers. That would be something like 24 drivers/side for a total of 48 drivers. This one at the link is about $12 each.
You do that and add a couple of decent powered subs and a miniDSP DDRC24 active crossover. That would be an awesome system in your little room. And you could probably build the whole project and be done for less than $3k. Take the other $7k and go to Europe for a week or so.