Help Fast!!! Repair Predicament - Gets involved!!

[SCOTTLT79]

Let me just start off by saying that I'm f#*ked,

I cracked my tranny case and I have a leak from my rear main seal.

Here are the quotes I'm getting from the garage.
To swap the tranny case and get the rear main seal repaired will be a total of $550.

They will replace the clutch while they are in there for no extra labor, just parts. I can go with the Ford Motorsport Heavy Duty for $209 or Clutchmasters for $299.

They will do all of the above plus a tranny rebuild for a total of $1,000. That's new tranny case, tranny rebuild, new clutch and fix the leak in the rear main seal.

I plan on getting rid of my car in April if I can find the right truck that will take the place of my baby. I don't know much about clutches but if that thing has more life on it, I would be better off just leaving it alone and letting someone else deal with it in a few years. I just don't want to sell the car and have someone need to replace the clutch in a few months. How long does the average stock clutch last: (miles?)

Please keep in mind that I don't have much money. For me, $1,000 would do some serious damage to an already heavy credit card balance.

Just want some other experienced opinions on this one.

Thanks
Scott