What I can see on the horsehead blade looks more like fine line engraving than etching. It also looks to have good hard gilding left on the hilt and I'm inclined to say this one is from Birmingham or London. Considering the blade length on that one, I would say it was for a light artillery officer. The plainer and longer blade is really quite typical for a mounted artillery blade from about 1810 to the 1830s. America imported bushels and bushels of them. Likely not later than the Mexican War period.
Only so much can be said without the swords in hand and appraisals are touchy at best via forums. Scabbards can double value, especially on the older pieces because few of the leather and brass ones survive well. The horsehead would do well at auction with better ID (even without precise description it would do well).
Thee are some folk that will do sword appraisals online. The aforementioned SFI forum is not one of them though probably the best collective effort for an ID. A Google search for sword appraisal brings up a few.
I see Ron Ruble pops up
http://www.ruble-enterprises.com/home.htm
Two more I have some faith in would be
www.gundersonmilitaria.com
and
http://arms2armor.com/
All three are dealers with good reference material and reputation for being pretty honest.
Someone else, whose site I don't seem to find anymore is Richard Bezdek. Ah, here he is. I know that he does charge a fee (as do many) but he is a noted author himself and is very much in the ID business.
http://www.theswordman.com/
The very first hit for sword appraisal on Google yields this site and list.
http://www.esa-swords.com/AppraisalService.htm
I had seen some of your postings previously and know you are looking to expedite these. It might be a good idea to move the swords through an auction house or on consignment at a dealer. Dealers would also be willing to make offers for entire collections. I hate to start listing all the possibilities, as it could be construed as spam on any forum but one such arms auction house is Cowans, another Manion's. Again, shopping aropund via Google might be helpful to you. While the provenance of coming from the author may help sales a little, I don't think most serious collectors would add a premium to the price in what they would be willing to pay. That said and as mentioned previously, the horsehead could do quite well at an auction unless it has more serious condition problems than what I see.
Cheers
GC