I see you have a 2002, so from what I have seen over the years most shocks from the factory are junk in 30,000 miles or three years, so yes you need to upgrade your shocks/struts. No use replacing the springs with out the shocks, like buying a new pair of shoes bit your socks have holes in the toes

may look good but will be uncomfortable!
OME Shocks/ struts are designed in a way that you do not "need" bumpstops but it is an extra safety measure in my book and also will keep you from ripping your flares off.
The Frankenlift is built with OME springs (Heavy Duty) and either Rancho or OME struts, also uses a daystar top plate and internal spacer, beauty of this is that it is all reassembled and easy to do.
OME/ Rancho shocks are just that its a great setup and can provide lots of miles of service to you for 650 or so American $$$
I have had mine on now for three years and if given 1500 to buy any suspension right now would buy the same thing, remember when you do a lift you want to upgrade from what you have. It may seem like a lot of money now, a lot of hassle but after you are done and riding down the road you will be like"why did I not do this sooner"
Good luck with what ever you choose
Tom