Rewrite my .htaccess file. ( problems with server and my SEF feature in Joomla )

Avg Bid (USD)
Project Budget (USD)
$30 - $100

Project Description:
Hey guys i have been having some problems with my .htacess files and it has been giving me a lot of errors with google webmaster.
I am getting an increase in 500 code errors and a lot of not found errors with my joomla site
I need someone to rewrite my htaccess file from scratch and fix all error problems i am having.
I need someone who is a PROFESSIONAL with HTACCESS and has done a similar project.

I have included a thread of conversation i had on a professional site for your reference and also what my Server company wrote me:
Please bid accordingly.

Here is the link to the professional forum where i posted this.
Please give me your advice accordingly

Also you will have access to my ftp and my webmastertools account.

Also i have attached the files here

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