The Control 1s are absolutely fantastic studio monitor speakers, but i wouldn't use them as fronts. For a start they use completely different cone types to the Missions- they'll most probably have a titanium dome or plastic cone tweeter (depending on whether is a Control 1x or 1g etc) whereas the Missions have soft fabric dome and the JBLs use paper woofers whereas the Missions use polypropelene. Get my jist?
Look for second hand Mission 751/752/753 on ebay or hififorsale instead. Should find some for £100-250