it depends on what your after really, if you want a loving pet that you can devote time to then aguinea pig would be great, they do come with some cost though as they are eating machines lol plenty of hay, dry food and a daily meal of veggies is a must as they need vitami C, they dont make thier own.
they are very skittish to start off with, but its all change for them, new house, new people, new smells etc..it takes time but they do warm to you.
mine are all friendly and like having a cuddle, my 2 boys live in my room with me ive had duke for 9 months and he jumps up at the bars waiting for me to talk to him and he's very relaxed around me and isnt scared of anything..ive just got my new boar who is 7 weekes old now and he's very scared still but you need to give them time, patience is a must lol i have some elderly ladies who are both 5 1/2 and they are both v friendly but i have looked after them for that long they know they can trust me
overall they are easy to keep, but do be prepared for taking them to the vets and the costly bills which all animals can bring
Also, if you rescue them, there are lots of guinea pigs in rescues, if you let us know which town your near I'm sure someone will know of one.
And its always best to buy as pair of guinea's as they are a sociable animal and like company, many of us have quite a few in a group i have 5 girls that live together, and then i have my 2 boars, more than 2 boars in a group and your probably going to have arguments.