I believe the link directories are fine within reason. Don't rely only on link directories but submitting to them I have found did any harm. I think if you have a good mix of link directories and natural links you will be fine. I would avoid low page rank directories.

You can see what kind of re-direct you have set up by looking at the .htacess file.

A 301 redirect from t-chek.com to thchek.com would be your best bet, it will pass through the link juice from links pointing to t-chek.com

You would need to edit the htaccess file for t-chek.com

Use "-" instead of "+"

Here is an article I always have bookmarked for URL Structure, even though it is from 2006, it is a good source of info from Rand.

http://www.seomoz.org/blog/11-best-practices-for-urls