I would really consider getting a Wii... honestly I would tell just about anyone that. The main weakpoint on your position is the dial up internet. I hope there is going to be a lot of online things, but Nintendo is hesitant just for the reason that you have, people with dialup. I would still get it. Personally, I don't have one, but I've played it. Multiplayer is priceless as I've heard. I would really consider it and look into getting it for Christmas.
At the very least you will be able to enjoy a few games and have great times with your friends.
ALSO: You cannot download old games if you don't have access to WiiConnect24 (online).