If you want passives I can do that. Since you have a center channel you could do this with a JBL MS-8, a pair of passives for the 4" and tweeters, and get some killer staging and imaging.
The passives I recommend are CDT MX-1000. These will cross the woofers and mids at around 250 Hz. However, for the price you're well on your way to paying for an MS-8, which is vastly more flexible, and the response is much more controllable.
Or if you're feeling adventurous you could build your own, they sell the PCB's and components individually as well. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif