Increasing Header Image Size

Has anyone figured out how to increase the Header Image from 220x75px?

Love this theme, I just dont like how the Header is so small. I think 350x 100 or even a but larger would be nicer.

Ive been trying to mess with the developer tools on chrome and I’ve seem to locate the issues under <div id=”header_container”>. It seems the Header is is part of a <div> called “row” and when I try to make the box larger, the 4 smaller boxes on the bottom move crazy.

Ill keep trying but I could use some back up on this. If anyone else has figured out how to address this please post. Also if anyone has any ideas I can try, It would be very helpful.

This is what I got tonight from working on it. Still cant get it the width I want it but give it a try and see what you can do:
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#header_container {
padding-bottom: 15px;
height: 125px;
}

#menu_container {
width: 650px;
}

#logo img {
width: 350px;
height: 100px;
}
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MyWebSite
Still under construction, but the purpler box is what im trying to make wider so it almost aligns with the slider image box.

Thanks!