I have a 120GB SSD for windows OS and key software like firefox, Adobe CS6, and COH. I also have 2TB of storage for porn, which is now full.
Fixed
He is right, though. SSD is only getting cheaper, because they are getting larger and larger. The ONLY true disadvantage SSD has over traditional HDD's, is that they have more limited read/write numbers, but its an insanely large amount, that you probably won't run out of in like 7-10 years, by which time you just upgrade.
The advantages? VERY fast speed. NO moveable parts, that means the disk doesn't have to spin up and also you can't accidentally bump your computer and mess up your HDD's (it can happen, especially with external drives!). SSD gets like a 15% to 50% speed increase depending on what its doing (booting up, launching an app, or running the app)
IMHO, money is always a big factor, but I'd rather wait another month or two to get the money, than risk a performance loss or even regret it and upgrade earlier than usual. I spent about $1600 building my current rig, but that was in 2007! I've only had to replace one fan, and thermal paste once! Its now time for an upgrade, but $1600 in 5 years? Thats like $27 bucks a month!