I had many guinea pigs while growing up. They are a lot of work, but also very cute and friendly. I started with two females. One passed away after only a year, so we adopted another female... who - SURPRISE! - was pregnant when we adopted her. She ended up having two babies, a male and female. I definitely prefered the females over the male, mostly because the male sprayed and we were told by our vet that it can be dangerous to try and neuter a small animal like a guinea pig.
Please read up on guinea pigs before you get them. Like I said, they are a lot of work - more so than a hamster or gerbil. We fed them twice a day, lettuce/carrots/apples, etc. and they always had hay/pellets/fresh water. We cleaned their cages at least 3 times a week otherwise the smell was unbearable. And if all possible, try and adopt from a local shelter... I think one of the reasons my first guinea pig passed away so young was that she was bought from a not-very reputable pet store.
And if you can, definitely get 2! Guinea pigs are very social animals and enjoy having others of their kind.
Hopefully I didn't scare you away! Guinea pigs are great... I was 10 when I first had them and the last passed away probably 6-7 years later. I wouldn't ever get them again (not even if my kids beg me... I'd probably get them a cat or dog instead, haha), but it was a fun experience.