External harddrive (also, what kind of internal drive does iMac use)

I was just wondering what kind of hard drive apple uses. I am getting an intel iMac soon and although I probably won't upgrade the harddrive now I may consider adding an external one later on.
My question is this: How come it is $300 to add 250 gigs internally on the machine? That seems like a lot of money to me(amateur)considering you can get external drives for almost half that. Is the quality that good, or is it just a matter of engineering?
Also, any recommendations of good external drives? Thanks!

Dunebug38,
Apple uses different manufacturers for their hard drives. I have a Western Digital hard drive in my iMac. I know that Apple uses Seagate hard drives also, and likely others, as well.
I couldn't say why Apple charges so much to add the larger hard disk. Apple charges more for memory too, at least beyond 1GB.
As for external drives, I have two Other World Computing external hard disks, both of which have an OWC case and Western Digital 300GB drives. I bought the case kit and hard drives separately, and installed the hard drive myself (which is quite easy to do). These work flawlessly with my iMac. When you look for an external drive, I suggest that you look for a FireWire drive (or combination FireWire/USB 2.0), and be sure that it has the Oxford 911 bridge, as this one is known to work well with Macs.
I hope this helps.
Joe
iMac Intel Core Duo 20", 2 GB RAM, OWC 300 GB FW HD   Mac OS X (10.4.6)   eMac 1.42GHz, 1 GB RAM; iPod w/ video 30 GB

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