You'll not get much mileage out of asking other people to choose fish for you. The choices that all the posters will come up with would just give you a huge headache leaving you none the wiser. If i was you i'd go to the nearest LFS and just have a mooch around and make a note of fish YOU like. You'll probably end up with a dozen or so fish that you really like. Make a note of them and then research them at home before purchasing (it's not always a good idea to talk to shop personel because in my experience, although they mean well, they haven't got a clue). That's why i suggest doing your homework on them yourself. Look at compatibility issues, any special requirements, growth rates, diet, max adult size etc etc. That would be how i'd go about it anyway.
I presume when you say you've already researched the hobby, that by this you mean basic nitrogen cycle knowledge etc. Because if you haven't researched the very basics then it dosen't matter if you get the most hardiest and simplist fish in the world to keep, chances are they'd be dead within a week.