I haven't bought any big disks for ages, so I'm a little out of date. I've looked at the curve of price-per-GB, but I don't have a handle on which disks people feel good about.
So...
What size of disks would you be happy to have in your server?
Four 500GB SATA disks, might have to upgrade again later
2(15.4%)
Four 750GB SATA disks, might possibly outlast the server
8(61.5%)
Four 1TB SATA disks, will very probably outlast the server
2(15.4%)
Which disks would you be happy to have in your server?
Hitachi
0(0.0%)
HP
0(0.0%)
Samsung
1(7.1%)
Seagate
4(28.6%)
Western Digital
1(7.1%)
Anything else you'd like to say?
I'll be recovering the existing disks -- two to redeploy as hot-spares in servers of a similar age, and two for desktop systems.