Hey man,
I didn't have Cingular before i used the treo, but i have good call quality, as good, usually better than I had with Nextel. i have tremendoulsy better coverage than i haid with nextel. also, depending on where you are overseas and if you are even allowed to use your phone, you can look into using your phone overseas for a slightly higher charge, but probably easier to have your own phone number than a calling card.
As far as MSN messanger, good choice, by the way, i don't think that you can actually install it, but there is a great application called verichat, which allows you to be on two different IM's at the same time. you can download it at pdaapps.com, try it out, and then sign up for a yearly contract. highly recommend it.
I use very little 3rd party apps, other than a bible, and have no huge problems, other than when i downloaded the upgrade for DocumentsToGo. (it was making every document reset when i opened it, so i deleted it and reinstalled the factory version found on the CD that comes with the treo). It does a reset some times, but nothing consistant enough to say there is a problem. like any other electronic, sometimes it gets overloaded or doing things in a wrong way, and it just needs a reset. no harm, no foul. but yes, the more you put on, the more chances for a bad mix to cause problems.
as for the music, this was a suprise for me, how well it plays music. i did have to buy the adapter for my sony headphones, but the screen goes off and it still plays, the volume is good, and the quality is very good.
to get music on to the card, i would recommend getting a SD card reader, using that to put music on, and the popping that card back into the Treo. make sure they are not in a file on the card. MUCH faster than anything else.
any one more bonus, GET A CASE! especially if you are out running, you don't want to have your hand of sweat leaking into your Treo.
anything else, post here, or email me at
clayton.bell@everynation.org. thanks for serving the country.