Hi end PR4 site with business - what is it worth?

A friend of mine has an ecommerce business selling organic goods and asked me to help her sell it because she has a radio show that's really taking off and now has no time for this project. The site is a retail site but also something of an authority site for organic items and composting. All the item descriptions are original and usually detailed.

The site is organic universe .com and .net I am trying to have some idea of what the business as a whole, including websites, social accounts, merchant accounts, corporation, etc as a whole is worth. She has a little bit of SEO understanding but most of the boost in this site has come from her social media work, where she is an expert. Think more of a social media personality, less expert at the "marketing" side of it.

The incorporation, website and business are over 8 years old. I know aged corps alone are worth 5k - and she has 8 years worth of credit lines. Other highlights of the business:

• highly sought after domain name in the organic industry with the .com and .net sites
• established and highly ranked social media accounts - twitter account with 30k real and naturally grown followers Facebook page since 2008
• blog (PR2 on the .net) - with several years worth of original posts
• forum - with 700 registered members
• established relationships with manufacturers
• page rank of 4 with hundreds of inner product category pages of pr3 and pr2
• SSL cert
• established relationships with manufacturers also with mfg's that will drop ship
• long established accounts with AMEX, Visa, MC, Discover, Diner's Club, JCB, Paypal
• established merchant account
• established relationship with Authorize.net
• member of about 10 or so organic industry related communities

Her revenues are something like maybe 5k a month but spike at Christmas - it was considerably more about 2 years ago (with account spread sheets to prove it) but has lagged since then because of her focus elsewhere. All revenue is just from ecommerce right now - no ads but her own - but because the site has many recipe pages, etc could easily drop them in.

Webdetail.org has the .com site as worth $8,300 and the blog as $2,300 - just based upon the traffic profile - which has been a lot less since she is not putting time into it. I would put more about uniques, pages views per day, keyword rankings, backlinks - but you guys probably have access to sites that I don't for such things and will have far more accurate info than I am likely to post. Do know that google has indexed 14,600 pages of the .com

My thoughts are this is the kind of site(s) that a real SEO guru who wanted to target the organic niche could make bucks off of - both with the blog and with the site. Gotta think that 30k REAL niche twitter followers alone is worth a decent chunk.

Any ideas what kind of price range she should be looking at?