I agree with RealBeast. Keep your Mushkin Enhanced Chronos Deluxe SATA 3 6Gb/s solid state drive and save your money.
What does you dad do with his computer? If he is not a hardcore gamer or pc enthusiast, then a value or entry level ssd will be fine for ordinary everyday use. For example, Samsung recently introduced two new models - the 840 and the 840 Pro. The 840 Pro is their flagship model and the 840 is their mainstream model. The 840 is less expensive than the 840 Pro.
I maintain the ssd database listed in the sticky at the very top of this forum section. Here is the link:http://www.johnnylucky.org/data-storage/ssd-database.html
Scroll down to the brands and models you are interested in and follow the links to the technical reviews.