Wordpress Designer to Upgrade My Site

Hey Guys. Im looking to get my current site upgraded. Its a tube style theme and i just use an embedder plugin to add videos to it. For my new site, i know the theme im going to use. I just need some changes made to it. I currently have over 2k videos on my site with all the titles, descriptions etc changed and 90% of my traffic is from search engines. Hoping someone can migrate the new site over without my rankings dropping.I need a login/register section part added where users can make a small profile and a few other things i have in a list. More details will be given when we chat. More than anything though i need good customer service. If theres any issues, i need to be able to get a hold of you pretty quick and not days later. If you can do this then just leave a post here so i can do a good check on your feedback etc then get in touch. Cheers guys