you won't like me saying this bud, but imo get a set of Logitech z-5500 speakers
http://www.amazon.co.uk/Logitech-Dig.../dp/B0006HBCL8
in my opinion the biggest problem you will have is lifting the sub-woofer - way over your budget, but mine have been worth every penny
wow, the 'used' option from my link is excellent value