Would you fix it or replace it?

[Pont406]

This truck always had a vibration since I bought it. Slowlly it's been getting worse. Anything above 70mph and vibration is real bad. I kept on putting it off. This morning I finally decided to check it out. Front part of the driveshaft vibrates a lot, second part is solid. Both rear tires are wobbling up and down.
Motor and trans are solid. So looks like am looking at both rear axles, balance or replaced front driveshaft and tires. Front end is wore out also, but at least right front shock stoped leaking. I want to replace wheels and tires anyway, add a front disc brakes and rebuilt front end. Also I am staring to see signs of rust. So, I am looking at about $2000-2500. I payed $1400 for this truck, I know too much. Anyway, should I fix this or get another truck? I saw a few good deals out there for about $3000. I need some ideas on this. Here are some pics that I tryed to take with it running to show vibration. I need to learn how to make a video. Thanks