What tire if I don't "off road?"

What tire should I use if I don't "off road?" on my 2001 P38, 4.6?

Ones made out of rubber.

Stock size, 255-65 X 16 or 255-55 X 18.

I was refering to Brand, not size. I have 255/55/18, General Tire, but I didn't get goow ware with them.

I'm also short on money.

Factory tires: http://tinyurl.com/6cp33d3

You will be hard pressed to find tires on a small budget.

Good luck,

18 inch rims and short on money do not make for good tire shopping. you might be able to swap your rims and tires for 16s in better shape.