Changes to an existing Joomla site.

At the moment, my site is running on Joomla 2.5 I havent updated to 3.0, just because I’m using a template called Youbricks, and I’m not sure it will work on 3.0 But happy to purchase the updated version if need be. [login to view URL] You can view my existing site at [login to view URL] These are the things I’m not happy about/want to change 1. CSS FONTS: I would like the default font across the board for headings and body to be Google Open Sans. The template uses Trebuchet by default, which I don't like. So on a lot of the articles, I’ve changed the font to Book Antiqua and changed some of the colouring, in the jce editor. But i’d like articles to pick up Google Open Sans by default. And I’d like a “quote” style in a different colour. But I will define all the heading styles - font, size, colour, weight etc clearly for you. 2. MENU: I never liked the menu on the template, so I actually just created separate “menu” modules for each page (there are main 3 menus - BLOG, BIO, CONTACT. The BLOG menu has four sub menus - ALL POSTS, DESIGN, TRAVEL, LIFE.) …but this is a hack…so I’d like a proper menu and sub menu system done, similar to what I have. 3. I'd like for the menu to be responsive, so that it disappears when under 960px wide, and brings just a small menu icon. (I suppose just code it so that those particular modules/positions dont appear at less than 960 wide screens) 4. On the DESIGN sub menu, [login to view URL] : there is a 2 column table with the image "LOOK WHAT I CAN DO FOR YOU" and some text. Is it possible for this to be responsive, so that when the screen gets smaller, the two columns convert to two rows?