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As mentioned above this is really very basic and doesn't inspire me to part with my hard earned cash.
I think you should spend some time browsing examples of minimal websites. There are loads of collections of them online and they all do simple black and white much better.
I think you need to spend a bit more time looking at structure and coming up with something more fitting for the purpose, rather than using a generic design that has been done many times before.
Specific problems with the design include:
The header is dull and uninspiring. I would remove it entirely.
The navigation is fine, but not very interesting, and there's no difference between the navigation text and the body text
The font used isn't a standard web font so won't be available to most users.
The body text is hard to read for two reasons. 1) black text on a mid grey background reduces contrast and makes the text lose strength. 2) The font is tightly packed
Some ideas/ solutions for you
remove the header and footer image.
remove the grey background on the body text.
increase the line-height on the body text
do something different with the navigation text. Maybe a different colour/ font weight. Try using borders to create interest.
One idea you could try would be to make the page background a really light grey (like #f5f5f5;), then make the transparent strip behind the logo/ tagline and the footer pure white. This would create some interest without going over the top with detail. It would also allow the colourful logo to shine.
