Just to point out you can't just "nick" someone elses logo. To use that specific logo you would need to make 7 seperate changes or your in breach of copyright and in some big trouble.
Personally from my perspective logo 1 is ok but as mentioned does not show a Knights helmet/armour. Logo 2 is ok but other than a shield motiff has very little to tie you into the whole Knight reference. Logo 3 for me has the most potential as the image is very simple, and therefore will lend itself to many medias such as print, web, signwriting and clothing printing. Also remember it is cheaper to minimise colours so while logo 1 may look nice so will the price for your printing. Keep it simple, logo 3 has the most potential, oh and just one other thing - change the typeface. The one on image 1 and 3 is awful and will be hard to read for some. Even if you go the classic Old English for the "Knights" and something simple (helvetica etc) for the "Tiling" would be better.
Make sure that your designer picks web safe colours too and if he picks spots make sure they can be closely reproduced in CMYK too or you'll have a multi coloured media should you get say your letterheads litho, your flyers digital and then a website as well. That will look gash and unprofessional.
Hope that helps. If you need anything else please feel free to pm me or reply here.