Buying advice raid 6

I'll admit that I don't know much about the RAID hardware but I have so far 4 1.5TB drives and will get more, and what I want to do is create a external storage system. But I think at the moment I will do it within my PC case.

So is that possible, to start internally and move the raid over to a enclosure?

I don't know what card to buy but I have looked at the new Adaptec ASR-5445, 8-port (4 internal / 4 external) Unified Serial RAID controller. LINK IS TO 4 - MORE PORT CARD.

That would allow me to move the storage out at a later date but what enclosure would be suitable to do this?

Its a mine field.

This would do as a easy solution but I don't want to be limited by the SATA interface.
Thecus N7700 7-BAY Ultimate tower NAS, 7xSATA HDD, 1x eSATA, Gbit Lan, RAID 0, 1, 5,6,10,JBOD

I guess another thing to ask, how would raid 0 or 1 work over 4 to 6 disks?

Advice required, thanks.

One of the best visual explanations of RAID and how they are configured can be found here: http://www.acnc.com/04_01_00.html

That should help with your multiple disc RAID0 / RAID1 question.

Meanwhile it sounds like you require an external enclosure capable of accepting control from a card in your PC.