going tall = alot of work, fabrication or money, or all of the above. I had 10" suspension and 3" body lift on one of my RC's before, it took alot of work and fabrication to get that. It wasn't alot of money since I did all the work myself.
An 8in lift is going to be pretty pricey, then you need to do driveshafts, brake lines, steering correction, etc. Adds up.