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I always prefer SSD's...SUPER fast and no noise/vibration.

But if you're budget won't allow it, get the Western Digital Scorpio Black.
 
You're not going to be losing some major battery life here or anything, maybe something like 15 min max.
 
The difference between 7200rpm and 5400 can sometimes be 1 watt or more. On a 10 watt total power draw (13") that can be 10%.

If your battery life is normally 360 minutes that would mean 36 minutes difference.

http://www.tomshardware.com/charts/2009-2.5-mobile-hard-drive-charts/Workstation-Type-I-O,1128.html

Al depends on what MBP, what hard drives and what usage we're talking about.

Most likely hardcore video rendering and some light gaming, but that would be plugged in. Will I notice the HDD be faster than the standard issued HDD that came with the MBP13" ?

Using on battery life, I like to put my MBP13" on hibernation a lot cause I move places to places. I'll be most likely to use Microsoft Office pad to take notes and surfing the web with the laptop.
I don't think a 36minute battery life drain means that much. I'm using my laptop on battery usage and I can get through my entire day with 40%+ battery life.
 
This review does a good job of showing the real world differences between 5400rpm, 7200rpm, hybrid and SSD.

Hitachi 7K750 750GB might be a good drive for you. Good performance and I expect it's a bit quieter and to use slightly less power than WD Black.

Myself I'm very happy with the 500GB XT Seagate hybrid drive.
 
This review does a good job of showing the real world differences between 5400rpm, 7200rpm, hybrid and SSD.

Hitachi 7K750 750GB might be a good drive for you. Good performance and I expect it's a bit quieter and to use slightly less power than WD Black.

Myself I'm very happy with the 500GB XT Seagate hybrid drive.

What about a 10000RPM?
I just randomly saw this on newegg as a suggestion.
http://www.newegg.com/Product/Product.aspx?Item=N82E16822148512

It's $1 a GB. But I assume it'll consume a TON of battery life?
 
:) Won't work in a notebook. It uses a different interface and power supply.

Thanks for the quick/fast heads up.
I would so get a SSD, but I need to be cheap, cause I'm about to be a broke college student.

I might consider a hybrid. How fast is your bootup time?
Is there a difference between 16/32MB cache? Will it affect the battery life? If so, by how much? Thanks
 
The Seagate XT is the hybrid drive I was talking about. It's the fastest 7200rpm drive for general usage.
 
On Amazon, the Momentus XT 500GB is $100 and the WD 750GB Black is $107. Is the 250GB difference significant enough to just stick with the 500GB XT?
 
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