A third option would be to install a used transmission. car-part.com has them for anywhere from $900 to $2400 for your application. How long were you planning on keeping the car before the transmission problem? If your answer was "indefinitely" then I'd get the rebuilt (adsitco.com has them for about $2700 but they aren't the only supplier out there). If you were only looking to get a couple more years from the car I might install a used one and save $1000.

Keep in mind that you wont get anywhere near what the car is worth if you try to sell it with a broken transmission. That's a guaranteed way to lose money.

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Jonathan

2011 Mazda2
2000 E320 4Matic Wagon
1994 C280 (retired)