Here's what I would do.
Get rid of this one, either sell as is or donate to charity, figure out the tax donation, see how much cash you can come up with and how much you're willing to spend.
If the tranny will run $2000 rebuilt{!} that means you'll need extra work to fix what the mechanic will fuck up while installing it. Then something else'll go.
Here's a 95 Mystique that sold for $2200 on eBay.
http://cgi.ebay.com/ebaymotors/ws/eBayISAP...item=2417208548
Half of your mileage, btw.
A shot tranny at 115,000 miles is a lemon in my book.
Get yourself a Camry or an Accord and be happy.