Drew,
Thanks for this! I am completly new in the MAC world and i try to understand all the tech talk in English :-)

but you are saying buy only 6*2 GB RAM from apple, and leave the 2 extra slots open where i can maybe put 2*4 GB in when they are cheaper and when i need them correct?
Basically the RAM in these Macs run most efficiently in sets of 3 chips. There are 8 slots for RAM, and the most efficient use is when there are chips only in Slots 1-3 and Slots 4-7. Now mind you sometimes these limits are more theoretical rather than reality based for day to day use to some degree as discussed in the links above, but that being said I have gone with this configuration on one of my machines and have not found myself running out of RAM (meaning 12 Gigs) pushing multi stream ProRes sequences through Final Cut, rendering color corrections in Color and running Compressor all at the same time. (Had to get some things done, and it is better not to do all of that at the same time of course...)
then the HARD DISK's are the same as a PC? so i indeed can buy easly my own extra hard disc much cheaper?
Yup, I throw them in and out all the time. There was some rumblings that perhaps the RAID Cards do not work with hard drives other than those "blessed" by Apple, but even that is not accurate when talking about the Towers. I pick up Western Digitals, Hitachis and Seagtes all the time and put them in. Nothing special (standard SATA drives)
And the video cards i was wrong they told me indeed to go for the ATI! and put a second one in if you need more then 2 screens.
Ahh, okay cool.
About the RAID card this guy was telling me this the thin i really need the most importend thing in the MAC PRO? You are talking about external options and Third Party cards!?!? help me here this sound like Latin for me :-)
Bruno
Not sure how up on RAID you are, but the are a few different ones (well more than a few), with RAID 0, RAID 1 and RAID 5 being common. RAID 0 takes two or more discs and makes one big faster disc, with the caution that if any one drive in the RAID goes down, you lose all data. RAID 1 "mirrors" data so that if a drive goes down, the second drive has the data also on on. So to make a 1 Terrabyte RAID 1 drive you need 2 1 Terrabyte Drives. RAID 5 offers some data protection so if one of the drives goes down, replace the drive. You lose the size of one drive in the RAID, in other words to have a 3 Terrabyte RAID 5, you will need 4 1 Terrabyte Drives. A 4 Terrabyte RAID 5 will require 4 1 Terrabyte Drives. There are also other versions and combinations. I will use various RAID configurations for different needs.
The Apple RAID Card lets you do RAID 0, RAID 1, RAID 5 and a couple of other things. It is not a good card and overpriced. I made the mistake of having one installed...it is a long story and I would never do that again. Yes, having RAID is important, especially with HD footage. Having the Apple RAID Card, however, is not needed.
There are a ton of options out there. For instance, you can get a 4 Port eSATA card Firmtek Four Port Card that can attach to their port multiplied FirmTek SeriTek/2eEN4. Both of those bundles run about $700. With Apple Disk Utility you can make software RAID 0 and RAID 1 with these and can get very good throughput. You can buy other software. If you would like a RAID 5 for protection, this OWC Quad Unit is $330 and has eSATA, FW and USB connections. More pricey are some products from Wiebetech such as RTX400
And others of course. There are different Pros and Cons to the various units (size/cost/noise/ease of use) and I have them all other than the RTX400, though I do have many other Wiebetech products.
An eSATA card and the various options out there which can be mixed and matched, such as using two OWC Quad Units that are each RAID 5, hooked up to two two different eSATA ports and made a RAID 0 via software..etc. If