Should i keep my olde cars or should i buy new one.

I have a chevy truck 1500 1991( it's clutch just went out) so it's just sitting in my drive way. Then I have a 1996 chevy caprice that I'm fixing now that's in grate shape, besides the paints going dull on it. Then I have a 1984 mecedes Benz turbo diesel...

300d, that has a lot of miles buts working grate. The problems with it is sunroof needs a new gear so it closes right and dash boad has some cracks in it from being so old.
Then I have a 2008 new 500r nija bike, that needs a new rear roator because it's bent, and some scraches on the bottom of it needsto be fixed. I put 4000 miles on it.

Now that you know I have these cars and bike. I need some advice on what should I do with all this? I'm the only one who drives all them. We have 3 car drive way and a small garage That fits one car. Also my mother has a 1999 mecedes and my sister has a new 2007 jeep it huge. My girlfriend's cars is always here too. My mothers car needs a new transmission and maybe so other parts. All the cars are in her name but the jeep and property tax for her isn't so good. She's always yelling at me telling to do something with the cars so I'm asking for help...
I think it be nice to have a new car? But I don't know if it's worth it? Monthy bills? And higher bills in genral.

Do think if I fix all the cars and sell them I can get enogh money to buy me a new car?
Or should I fix all and keep one or two?
But I don't know what I want I like these cars. There good cars. But in the long run I don't know what's going to happen to them and the value is lowering. I need to do something. Please some one give me advice!!!
M

Get the money you can and get a newer(not new) car with gas mileage above 25 mpg. Gas is estimated to be back up to old prices within 3 months, so you'll save yourself a lot of money getting something gas friendly and reliable.

Old is Gold!