100.00$ saw for a HD.... it´s kind a bad deal for me...but if you realy need it go for it!

Another thing, you will not notice much of a difference between a phisical sata II drive and a sata III drive.
What could you buy either for? WD, Black Label, SATA III, 500 GB or 1 TB?
Locally where I am in the US the best price I can find for a WD Black Label 500 GB SATA III runs $85.00 and the same but at 1 TB runs $110.00...both rounded up. He has both. I'm sure he paid less since he buys in bulk, but I have to go by what it would cost me to go buy one.
The bigger thing over SATA II compared to SATA III is the age of my existing drives. Also I need to leave one in the old system for it to be useful. It is also set-up for two drives. I'd rather trade something I'm not using for a fresh faster drive with a new warranty than toss an old drive past its prime in a new system.
Lastly, this is an old friend named Jim, especially with this guy we have traded and given each other computer freebies for decades. We used to attend computer shows/sales/swaps together when I worked and had money.

Before the Internet days we used to frequent a local BBS run by a disc jockey, it was called Radio Daze. A group of about 12 of us RD users started what we called a M.U.R.D.E.R. we'd hold every 3 months. It stood for, Michiana Users of Radio Daze Eatery Rendezvous. I live in an area we unofficially call Michiana...it is on the border of the states of Michigan and Indiana, hence Michiana. We'd meet at an eatery (restaurant) and BS all night and bring our unused computer stuff to trade or give away. It was fun calling to make reservations for a M.U.R.D.E.R. We helped some folks like myself in the situation I am in now, we'd get our used parts together and build them a system. People knew to contact me, Jim or Don (he had tons of stuff) and sometime the DJ Mike if they knew somebody in need. We all had used stuff, plus I had the expertise to build or repair. Usually nothing new except maybe a hard drive, but at least it kept them going and on-line. When the M.U.R.D.E.R. group started we ended up with 6 new hard drives when I found out guys had replaced hard drives still in warranty and still had the old drives...all were 3 years back then. I got everybody to check their old drives laying around, I got them all replaced and saved them for somebody in need.
I miss that local BBS community of computer users. I get that feeling here though, we are just all over the world.
(/RAMBLE)