i am assuming that the trucks is a 4x4. and the tires sticking out has mainly to do with the wheel backspacing. but a 4in or 6in pricing wise will vary from manufacturer to manufacturer and on the options you choose. check out some sites like
www.4wheelparts.com or
www.suspensionconnection.com or
www.rockymountainsusp.com and check there products and prices to see what fits you best. i would go with a 6in and 35's.