Simple graphic touch up

I'm building a guitar pedal, and I am going to get a graphic etched onto the top of the metal enclosure (an example of what an etched guitar pedal looks like is attached in [login to view URL]). I have created the image I want to etch (see attached low [login to view URL] / .psd file), but as you can see, it's a very low resolution image (72dpi) with lots of blurry lines. To perform the etching, the image must be at least 300dpi and with much cleaner lines than the low [login to view URL] version. I started trying to make a 300dpi, cleaner image (see [login to view URL] / .psd file), but didn't get very far. Basically, I need someone to touch up all the lines and make them the same thickness and clear in 300dpi. The image must stay the same size as it is now (4.7 inches by 3.7 inches, with a few pixels between the actual edge of the image and the black border of the graphic). Keeping in mind the design style I am using for this graphic/project, if you want, feel free to inject your own creativity into the graphic a little bit by adding in more fancy lines, altering fonts, or doing whatever you think it will look the best when etched. Of course, you don't -have- to do any of that. The name of the company is Keltone and the name of the guitar pedal is Wibox.