I have a manual pump. It didn't cost much and came in handy a few times. I would never invest in an expensive pump because I don't feel that I would use it enough. But I'm really glad I bought the manual.
but to answer your question - no, it's not something that you need. Lots of moms never use one. And if you find that you want one later you can always buy it then It's not recommended to pump for the first 4-6 weeks anyway (until your milk supply is established and you and your baby have figured out the supply/demand thing)