Congrats on the new system. Like everyone else said, you're choice in film will come down to what you like so don't be afraid to experiment. From what you said tho, you might want to stick to print film because it's more forgiving than slides. Kodak has an Ultra Color print film that is pretty decent. I have only shot one roll of it tho, so take that endorsement for what it's worth. I think it called UC or something like that. Buy a roll or two of whatever trips your trigger and see what you like.

One tip I read that made a lot of sence to me was that when you're done shooting a roll of film, load your camera with a different film, and take the same photo that you just took with the last roll. If you do this a few times when you finish a roll, it won't be long till you have quite a few shots to compair the dif. types of film to. So when you finish a roll of Velvia, throw in a roll of Provia and then look at them side by side when you get them back. Good luck!