So I chose RAID, but now...which type should I go for?

People on this forum are debating on performance differences between HDD configurations such as 2x320GB seagates in RAID-0 , or a 150GB Raptor.

For example -
- 2 x 320GB on Newegg would be roughly $160
- 1 150GB raptor would be roughly $185ish or so depending where you get it

Now the question in my mind is, what about 4 x 80GB? It seems a little risky but I honestly wouldn't be too worried about failure as my important stuff will be saved on externals. But I would worry about trying to find out which one failed =x

Regardless of HDD brand, buying a configuration of 4 hard drives + shipping would cost roughly $200. But needless to say, thats just about exactly the same price as two 37 gig Raptors.

What would be the best for me? I don't care about space much, as I have multiple external Hard Drives.
I'll be using it for web browing, encoding/decoding, zipping/unzipping, and games. A game like Everquest (MMO) for instance, and whichever new games are coming out in the future (going to be a gaming computer)

Also, my budget is no more than $200 for a drive, or multiple drives. Any input is appreciated!

Thanks

raptor is faster for small files and loading apps, raid is faster for copying large files.