I went with a 90GB OCZ Vertex SSD and World of Warcraft use to take about 10 seconds to load and it has been cut down to around 6 seconds. In addition to this functionality within the game has also gotten better such as when teleporting or hearthing ( quickly jumping from one map location to another ) takes about half the time. I initially tried this drive out to be used for both my OS Windows 7 32-bit + WoW and while it did speed up my boot time, I found that I actually get better gaming performance if I keep the OS and the game seperate on 2 drives. So I have my OS booting off of a 500GB SATA II drive and WoW and other games on this 90GB SATA II SSD. Load times for games are about 2 seconds faster by keeping OS and Games seperate. So Thats how I am running for max performance. Also to note my SSD is SATA III with SATA II reverse compatability and so I am running this drive at 3.0Gb/s vs 6.0Gb/s. I checked into upgrading to SATA III, but from what I have read the gain is not 2x faster performance because the drives that are SATA III are not takeing full advantage of the 6.0Gb/s SATA III just raises the ceiling of the max speed when it comes to drives. It doesnt mean that drive will perform at 6Gb/s!
Here is my drive:
http://www.newegg.com/Product/Product.aspx?Item=N82E16820227759Since this purchase I also bought a 60GB OCZ Agility SSD and installed that in my netbook which is running XP Home SP3. Fast Boots and much longer battery life, but at the cost of space for data. I bought these with a rebate and received American Express prepaid credit card in return for $20. Found out that lots of places dont take American Express, BUT McDonalds does! =)