Here's my submission. I went with a flat UI because that communicates that you're at the cutting edge of technology. No drop shadows or anything like that, as those are starting to look dated. Judging from your website I see that Keyhotee will be released in a month, so I designed with the focus around that. News has been rebranded as Blog, because it has more of a community oriented feel than a press release feel. Twitter, Facebook, and YouTube icons have been added to give a focus to social networks. Social networks help websites grow, with not really any negative effects. Right now a strong social presence is critical to startups.
You definitely want to put your relation to Bitcoin at the forefront, so Bitcoin is in a big font and showcased.
To be honest I don't think the big issue with your website is the interface. What needs a bit of work is how you explain your products. Keyhotee is a really great idea, but it's hard to understand what exactly it is from your site. Right now it's perfect for people like me who understand Bitcoin, and have done a lot of research on it. Unfortunately most people who just know about Bitcoin from seeing it on TV and in news articles are going to leave the site confused, without even having an idea of what it's about.
I propose that you make the site a bit more mainstream, with the important details on subpages. As it stands right now it's not very accessible to the general public, but I really believe your product offerings deserve to be. This is something I could work with you in if your'e interested. I specialize in mobile UX & UI design, but most of it translates pretty well to regular website design.