Looking to add new HDD - Have a few questions

Hi everyone,
I'm looking to add an additional internal HDD to use for storage (just movies, music, etc., not the OS) and have a couple questions.

1) A friend told me that there could potentially be issues with my OS being unable to see more than 2TB of disk space. he didn't know the specifics, so i figured I'd ask here.

Here are some of my computer's specs (let me know if any more info would be useful):
-OS: Vista Home Premium (32 bit)
-Motherboard: four SATA 3Gb/s ports (http://www.newegg.com/Product/Product.aspx?Item=N82E168...)
-Current Storage:
-One 500 GB drive (the OS is installed here)
-One 100 GB drive (just for extra space)

Anyway, if i buy a new 2TB drive and put it in, will I have any issues?


2) I'm looking for recommendations for a new 2TB HDD if anyone has some favorites. Obviously I'd like it to be cheap, but I'm not apposed to paying a little more if there is a significant difference in quality/reliability. I'm thinking in the $100 area, but again feedback is welcome. I'm pretty sure my motherboard only supports 3Gb/s.


3) Just out of curiosity, does 6Gb/s make a difference for most HDDs? I'd think that most would have trouble taking full advantage of the 3Gb/s without a RAID setup or something.

EDIT:

4) Could i use a 6Gb/s HDD with a 3Gb/s SATA port? and if so, would it be worth spending a little more on that if I'm looking to transfer it to a new computer when i rebuild in about 6 months?

Thanks so much for any help!