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Im on your homepage. When i copy your source code to my editor and look at code, i see the deminsions stated above.
Somewhere in one of the templates or ? that you attempted to modify there is still the size 150x80. this is why your logo is so small now. when you changed the "banner" in the "banner admin" it did not change the template because you modified it via "code". Now you have to retrace your footsteps in regard to your image.
if you changed the css file or theme html or some other file BEFORE you inserted your current logo , you need to find that code that you modified and locate the 150x80 size and replace it to your current logo size. Im thinking should be about 550x80 or so. Im just looking at it in my editor, but you need to find that code and replace the picture size.
ALSO: goto system admin > Modules > and "refresh the system"this will update your template files that have been modified.
I hope this is helping you......hard to see through the screen, trying to help