HitACHI Hard Drive Problem!

Hi every one!

I have a little problem that I can really use some help with.

I just bought a HighPoint RocketRaid 4322 RAID Card. newegg has it for the lowest price I have ever seen! Here is the link if ya want to check it out

http://www.newegg.com/Product/Produc...82E16816115061

I am building a 8 hard drive Raid I think it will be a 8TB... here is why I say I think...

In my Mac Pro I have 3 1TB HITACHI Deskstar 7K1000 HDS721010KLA330 (0A35155) Hard Drives- here is the link to them on newegg, but they have stopped selling them.
http://www.newegg.com/Product/Produc...82E16822145167

My problem is, I was trying to find the same drives so I can just buy 5 more and pull my other 3 out and RAID them all together. But since its been some time since I bought those drives, Hitachie has updated there line with a Deskstar 7K1000.B version which has 3 platters and the Deskstar 7K1000.C which has 2 platters.

I came across Hitachies update to the hard drives I found the Deskstar 7K1000.B on newegg for only 80 bucks
http://www.newegg.com/Product/Produc...82E16822145287

But If you take a look at it I dont think thats really the Deskstar 7K1000.B version because it has 32Mb of Cache and the Deskstar 7K1000.B should only have 16Mb. So which is it? I could find that model number on hitaches site. Is it the .C version or is the version I have? Im confused.

I would like to find the same drives I have but if these are a new version and are only 80 bucks then I wouldnt mind getting 8 of them and keeping my other 3 where they are for back ups.

I hope this makes senses to some one.