Hi Amber:
Most of the components you have are models that Sansui made in the 1980's that were designed to be used together in a "modest" stereo system (see photo below taken from their 1981 catalog).
Of course, you can mix & match the various components, and it wouldnt make much of a difference- in your case, for example, you have the D95M cassette deck, instead of the D-150M shown in the combo-rack system picture. Sansui made quite alot of other all-in-one, matching systems, such as another system comprised of the smaller A-7 amplfier & T-7 tuner, which the D-95M deck goes together with (which I see in the catalog I have), but really, the actual order of components doesnt mater that much. Ditto the speakers, in the pic shown below, the speakers are the S-57's, whereas you have the slightly older design SP-X6900.
As for the selling the stuff, well..... all the components are decent, but as I mentioned before, its geared more toward a 'modest' system, they're really not in the class of the more expensive & better built products that Sansui made. And I dont mean to say that in a way that sounds like I am belittling what you have, I'm just stating the general facts, hopefully you understand.
Well, one advantage you have is that the A-9, at 65 watts of power, is the largest model of the three in the A-9, A-7, and A-5 models, so with that in mind, you can generally get more $$ with the larger size amps (as opposed to the smaller, lower wattage models in the product Line). And somewhat to the same degree, ditto the corresponding Tuners ("radios") T-9, T-7, & T-5.
Quite honestly, if you can get $100 for it all, its about what its worth. I suppose if you had the actual GX-95 rack to put all the componenets in, you could sell for more $. There are some people out there who seem to like Sansui speakers, so perhaps selling the speakers separately might bring in some more $$ for you. You can check Ebay to see what the interest is in Sansui speakers and what the avg prices are - you can do a search on 'Sansui Speakers' for the auctions that are currently running, and also the 'Completed Auctions' of the last month. Another option is to check a similar model to yours such as the this one, the next model above:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=50597&item=5709321893&rd=1
Keep in mind, when it comes to speakers, its preferable to sell them to someone who can pick them up from you in person, as shipping them is a delicate procedure - speakers need to be packed with the utmost care in order to avoid damage in the shipping process, and the effort in doing that is quite time-consuming.
B/F