ehh plenty have done this and/or doing so right now. Ride quality wouldn't be the best it can be if you had better/new shocks. Also depends on the springs you choose. In the end, your stock strut/shocks will blow and you'll need to buy new ones and not have anything to go back on if you needed to. On the other hand, save more money and do it right the first time and keep your OEM stuff.
I've been on Eibach sportlines w/ stock struts & shocks for well over a year now. The ride quality is affected somewhat but not like I thought. However I know its only a matter of time before they blow. Like mentioned previously if you can save and buy everything together do it. It'll be worth it in the long run.