I'm using JBL's (ES90 * 2, ES25C * 1, ES250P * 1 and ES20 * 4)

http://www.jbl.com/home/products/ser...&Region=EUROPE

Very happy with them

Using smaller speakers or less speakers or a find a special on and you could get for the high side of your budget.

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Arguably my Automobile is Awash with Alliteration - Subaru Sti S202