Yes it's realistic

Not the ultimate quality of course, but should be do-able.
You're looking at something like this;
http://www.avland.co.uk/ms/premiereplus/ms-premiere-plus.htm
This paticular setup may also be available with the 308 sub, but go for the 309, as it's far superior.
If you're looking to buy seperately, go for 4 902s, 1 905C centre and the 309 sub (all by Mordaunt short), but I think this will exceed your budget.
Shop around very carefully
Just one option, there are plenty of others and hopefully other members will give you some suggestions
