Do not sell them for $700!!!
At first, I thought this was a joke and then I looked and saw you just recently signed up with Audiogon and asked for help selling equipment you acquired. So, assuming you probably do not know too much about this stuff, I can help with the speakers.
The Aerial 7T is a current model of a fairly high-end speaker by a well-regarded designer. The original retail price was $9,850/pr. and it is probably still that, or maybe higher. I have linked a couple of very positive reviews of the 7Ts below. One is from Stereophile, a long-time audiophile magazine that conducts reviews of stereo equipment and speakers. They reviewed the 7T (link below) and their editor, who performs measurements of the gear being reviewed, concluded with this:
The measured performance of the Aerial Acoustics Model 7T confirms both the speaker's excellent sound quality and the expertise of its designers.
To provide further help, of all the stuff listed in your original January 20, post, these 7T speakers are the jewel of the system and the most valuable piece. There is a free website called HiFi Shark that provides information on audio items for sale and items that have sold. Be aware the prices shown are the asking price and not necessarily the selling price. However, the 7T speakers that have sold over the past year or two routinely went for between $4,000-$5,000. Below is a link:
The Aragon 8008 amp is ok too and was based on a design by Dan D'Agostino, a well-regarded designer from a company called Krell and now with his own brand, Master Audio Systems. It has been in production for a long time and I believe there is a current version of the 8008 that sells for around $7K. You need to do some homework and find out the age of the amplifier since, depending on whether yours is one of the older versions or a new amplifier, your selling price could be in the range of about $1K to about $3K or maybe a little more for a new model with box and paperwork. Below are review links including one from Stereophile from 1996 and two reviews of the newer model 8008.https://www.stereophile.com/solidpoweramps/562/index.html http://www.theabsolutesound.com/articles/aragon-8008-power-amplifier/ https://www.avhub.com.au/product-reviews/hi-fi/aragon-8008-power-amplifier-review-and-test-401078
One last bit iof advice on the Aerials, try to sell them locally if at all possible or to a buyer that will drive a little to meet you half-way, so you do not have to ship them. Shipping damage for large speakers is not uncommon when they are simply shipped in the manufacturer's boxes - although I have owned two pairs of Aerial speakers and their packaging is better than most. Ideally, for shipping, they should be strapped to a pallet and shipped by freight.
I hope this response is helpful to you.