domain Appraise: Single word .com & other extensions

[DomainMiner.com]

Hi. My partner & I want to sell this package deal to the right buyer, but are not sure how to price it / what to accept as minimum, so your opinions are appreciated. The domains were hardly used, so traffic/links/etc are not a part of the value, although it might get typos and such, I haven't checked. I think it's very brandable (obvious logo), short, easy to remember (especially with the right logo), etc. The word has 5.7M google results. Hoping that appraisals will be good but am looking to know honestly what they could bring in if I sell in the next months. And I suppose we should try to contact relevant companies individually? Post or PM. Thanks.

conical.com registered Aug '96
conical.net registered May '00
conical.org registered May '00
conical.biz
conical.info
conical.us