It (grad school) also kind of depends on what you want... not 100% so much on what you actually get your degree in.
I know someone who majored in English but did all the pre-reqs for medical school. Went to medical school after undergrad, then immediately upon graduation with their MD, went straight to law school... never had any intention of practicing medicine, but instead wanted to go into malpractice law.
If you're into biology or maybe even modeling you could consider grad school in bioinformatics (what I'm doing now). Most people have no idea what it is when I tell them what program I'm in, I usually go with the standby of "computer science and genetics", but it's a wide open field so you can find your niche almost anywhere. Know someone who did his undergrad and Master's in Electrical Engineering before he went on to the MD/PhD program in bioinformatics at my school. While most go into academic or industrial research, a few from my program have (or want) to get into quantitative finance, work for Google on algorithm development, or Amazon.
I think with computer science you actually have a lot of options regarding post-graduate academic options... it really is going to depend on what you actually want out of it.