I appreciate reading all of your comments. I tried to price out a somewhat similar system and came up with higher than $665 but less than the offered price of $1300 (I just wanted a rough range). I do tend to take on many of these projects myself and consider myself a fairly savvy DIY'er but don't know much about Linux, Samba, etc. so the ready-made version sounds great to me. I had an earlier RAID system (albeit RAID 0 for speed) which worked for a while but ended up with some problems so I am looking for a turn-key system that has some offered support. It looks like this product will work great. I personally like the advantage of using different sized HDs as I probably have 3 250GB, 3 300 GB and 2 400 GBs. I would lose out moving to a RAID 5 system. I also haven't seen a RAID 5 system (pre-built) that doesn't cost a great deal more or is expandable to 11-12 Hard Drives. I do tend to agree that I probably plan to add rather than get rid of old drives though (or I wouldn't need all this space in the first place!). I plan on buying a couple of additional drives (probably 400 or 500 GB) and putting them in the array and copying from the aforementioned drives and moving them 1 by 1 into the array. Anyway, I think I'll take the plunge and I'll be sure to post my experiences on the board.
BTW, I would think that more and more people will ultimately want to move to some backup solution/redundancy solution in the future as people become more dependent on computers and the personal information they contain (Downloaded Music, Digital Pictures, Digital Video, etc.) Just my thoughts!
The only concern I have is whether my modded XBOX (or any other media client like the DSM-320, etc.) will be able to correctly access the server as it is Linux based but assume that I won't have a problem as SAMBA/SMB will provide any Windows based client the ability to do so.