Ask HN: What's a fair price for an "app" website, and related blog?

I'm currently writing a music app ("Infinity -- the looper that knows your song") for OSX, and I'm at the point where I need create a website and blog. The website should be single-page, essentially displaying screenshots and/or screen capture as a banner, along with the typical 3-column "major features" thing below. Also, the site should have the ability to accept payments via credit card or PayPal (i.e. you should be able to buy and download the app).

I was thinking that both the app page and the blog could be done with Wordpress. So essentially, the work involved would be:

  - designing a custom theme
  - configure Wordpress so that I can easily upload new content to the main page (e.g. banner and feature parts) and blog (posts)
  - configure the e-commerce solution

I'm interested in knowing a ballpark figure for a) the design and b) the implementation of such a site.

For reference, I've been quoted a price between 450 EUR and 1500 EUR ($600 to $2050, depending on time taken) only for the design, for each of the blog and site (i.e. twice the that range for total!). I think that's a bit steep, but it's the first time I've commissioned design, so I don't have a good reference point. At that price, I would have done all the Wordpress configuration myself, since it's not really that hard.

UPDATE: I had the wrong figures for quoted price.

Many thanks in advance!