Everything seems complex at first, and HTPC is no exception.
But the more you read and learn, the simpler it seems after a while.
Less than a year ago, I had never even opened up a PC; I had never installed RAM or anything on a desktop PC.
And now I have built 6 PCs from scratch.
It you want the EXACT bit-for-bit duplicate of a BD, you will need a PC with at least a $50 ATI Radeon HD5450 graphics card. This will allow you to bitstream DTS-HD MA/ Dolby TrueHD/ & PCM from your PC to your Receiver/Pre-pro.
You have to use Power DVD10 Ultra as the software.
You will need DVDFab blu-ray to blu-ray software. This will allow you to rip just the main movie to your hard drive. Since you are concerned about quality, like me, you don't wan't to COMPRESS anything.
A 1 hr BD main movie is about 11 - 13GB.
A 2 hr BD main movie is about 25 - 30GB.
A 3 hr BD main movie is about 40 - 45GB.
Lord of The Ring (each movie) is like 47GB.
Avatar is like 47GB.
I have a 24TB network storage (NAS). Each of my other 2 HTPCs in the network has 6TB of HDD.
You will need A LOT more than 2TB if you want to store BDs uncompressed.
I don't see the point of compressing movies because you will lose a lot of picture quality. What is the point?
Just get some more HDDs.
Get a BIG PC case - like the ANTEC 1200 (or similar for cheaper prices).
I have the Antec-1200 case. I also bought an additional HD cage (3 more slots for HDDs). So I have a total of 12 HDDs. Each HDD is 2TB = 24TB.
I used an external BD-ROM for loading the OS - Windows 7 Ultimate 64-bit.
Oh, yeah, you will need Windows 7 for the HD-audio bitstreaming.
Get a motherboard with 6 SATA connectors. Get 2 more RAID controllers (like the Syba or similar that has 4 SATAs on each PCI card).
Anyway, that's a lot to digest if you are new.
Just keep on reading and learning untill it doesn't seem new anymore before you start building your PC.
But anyway, prices:
Case: $90 - $150
Motherboard (MoBo): $60 - $150
CPU (Intel 2.6GHz Dual Core 775 socket): $60
RAM 2GB: $50
Power Supply (PSU): $50 - $100
ATI Radeon graphics card: $50 - $150
HDDs 2TB: $130 - $150 each.
BD-ROM External: $100 - $150
BD-ROM Internal: $60 - $150