Alright so I called Alesis earlier today with some questions I had and here's what the guy told me:
1) Is this kit expandable? For example, can I eventually have it look like the Roland TD-20 with all those extra toms and cymbals?
Yes. And at a mucher lower price point as well.
2) Is it possible to use double bass with this?
Yes. He mentioned just using a double bass pedal but I would much rather have two kick drums instead. I forgot to ask him about the two kick drum thing but I'm sure it's possible since the trigger I/O has several input/output options.
3) Is it possible to put other drum heads from different manufacturers on this kit?
Yes. And if I need to replace any of the heads or cymbals I can also do this through Alesis.
4) Sweetwater.com mentions that this kit uses USB 1.1, if I plug this in through my 2.0 port will there be any problems and will I suffer in sound quality?
No. If you plug in the 1.1 cable through a 2.0 port the port will automatically detect the 1.1 technology and use that instead. (I don't really like this idea but I'm not complaining since I'm sure they'll eventually come out with a 2.O interface.)
5) Can I move the arrangement of the toms and cymbals to better suit my needs? For example, in the pictures I've seen so far the snare drum seems to be too close to the hi-hat. So would I be able to move it more towards the center?
Yes. You can arrange the set-up in any which way you like.
6) Warranty information?
1 year manufacturer's warranty for parts and labor.
Thanks again for the great recommendation Pistolpete, I think we have a winner on our hands!!