I don't see what the IDE drives are in your link. It is generally true that newer drives are faster than older drives, and SATA drives are faster than IDE drives. I am positive that someone will be able to find exceptions to these rules, but for the most part they will hold.
Take your optional $100 and either splurge on a high-end drive or buy a 500 GB SATA drive on the cheap from a local store. For example, this one (which I am not endorsing, just using as an example) for $50 plus shipping:
http://www.newegg.com/Product/Product.aspx?Item=N82E16822148488
You do have a backup plan? If not, make one!