So VH is dual booting...

[BlutEngel]

I would suggest a 500 Gig Quiet Western Digital Caviar SE16 Hard Drive. Depending on your current computer, this might be an upgrade. I am using this Hard drive and there is never hear any sound coming from it.

Is a 500GB WD Caviar SE WD5000AAJS good too? I'd really like to have a new hard drive since I'm low on space, and since I never changed anything at my computer but RAM, should I worry about it fitting in the case? :s

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[Digmaster]

It doesn't look that bad (it appears its a bit loud, but I don't own this drive, looked at customer reviews.)
http://www.newegg.com/Product/Product.aspx?Item=N82E16822136178&Tpk=WD5000AAJS
Now, do you want to replace your old drive? (would not suggest this, as it is nice to have lots of space)
If so, check to see if your old one is sata, if so, your ready to go. if not, see if your motherboard supports sata, if not, sorry, it will not work D;
If you don't want to replace it, check to see if you have Sata ports on your motherboard. If so, buy a Sata cord (http://www.newegg.com/Product/Product.aspx?Item=N82E16812123191)