7130 would be a good phone and email device. PIM is pretty decent as well except it lacks a bit in calendar/task functions. No free AIM clients to my knowledge for any BB. Not sure if the 7130 supports MP3 ringtones or not. I don't believe it does though since I think the 8700 is the first BB to do that.
The blackberry has always been an email tool and it is by far the best there is when it comes to email. It does play the role of a decent phone as well, however if it's ringtones, solid PIM, and 3rd party apps you're looking for you might find that the treo 650 is a better fit for you.
Keep checking here though as I'm sure others will post their responses as well so you can hopefully get a better idea of what other BB users think.
take care
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