Yeah, you're gonna need a lot more delta-V than that if you want to get to Saturn directly. Your other option is to get there via VEEGa (Check out Altaïr's Gravity assist tutorial for that). Even with that though, I don't think your rocket is gonna be enough. I'd suggest going to Horus Lupercal if you need advice about rocket optimization. Not in this thread though please, I want to keep it kinda on topic. I can try to help you a bit too if you want, but I've been really busy with college lately, so I might not be able to help very much...