I'm torn between Nidoran Female and Abra. I have no real use for Pokemon (in a real world sense), so just having a Nidoran around the house would be no different than having a rabbit, except Nidoran would actually have some sapience. It's kind of a winning scenario no matter what Pokemon you ended up with, except maybe Slowpoke. The downside to Nidoran is being covered in poison quills, but I'm sure you just have to handle them the right way like a hedgehog. And have a lot of first aid serums.
Abra, though, and assuming I couldn't just jump straight to Alakazam, would make a whole lot of my not-fun work easier. I'd see about getting it evolved into Alakazam as soon as possible. If he can get around to applying stubby fingers to keyboard, I'll let him write my thesis. I just wanna draw stuff. :(