Metal Gear Solid 4 can be bought seperately, and if you aren't into SACD's, I don't see any reason to get the old style one.
Also, 40GB is really enough in my opinion. I have a 80GB and it's not even close to being full. Metal Gear Solid 4 takes up 20GB, but that is because it is a dual layer blu-ray and an absolutely huge game. Everything else takes like a few gigs. Plus, if you ever need room you can always remove installs.... I'm usually only playing a few games at a time anyways and my music I play through the network.
The ONLY thing I hate about the PS3 is Sony's constant change of systems, numbers, etc. with the PS3. I can't keep up with what does what. There's like 3 different 80GB models! Ridiculous.
Yeah, who knew. I wonder why they changed the new ones to not play SACD? I can understand not having PS2 emulation, because that was kind of a way to get people to step over to the PS3 that had PS2 games if they were thinking about going to another platform.