I think I have it narrowed down to one of these two:
http://www.nextag.com/st910021a_-_rk/search-html
http://www.newegg.com/Product/Product.aspx?Item=N82E16822148130
Can anyone vouch that the 7200 is that much faster than the 5400 to make it worth the extra price and/or lower storage capacity? I can say I plan to do quite a bit of video editing. Is the 7200 too sensitive for a laptop?
The 7200rpm notebooks drives are engineered to work in notebooks, so they should be fine. Whether there's a tangible difference in performance is another story.
My only experience relates to an older Dell Inspiron 8200 notebook (P4/2.4GHz, 1GB RAM) that came with a 5400rpm drive originally. When the first 7200rpm drive came out (Hitachi Travelstar 7K60), all of the websites I frequented commented about how much faster it was than a 5400rpm drive in the 8200, so I paid the then steep price of $200 for the drive. Needless to say, I was underwhelmed. I couldn't detect a performance difference.
Now, that was a few years ago (2003?) and 7200 rpm drives were bleeding edge at the time, so I don't know if they've been further refined over time. But in my opinion, unless you're really annoyed at the speed of your machine with the current 5400rpm drive, then save a few bucks and go with a 5400rpm drive.
Also, I wouldn't worry about reliability - especially if you buy a Seagate drive as they have 5-year warranties (the Hitachi drive in my old Inspiron 8200 is still going strong - sold it to a friend a few years ago).
To answer your other question - EIDE, ATA-100 and Ultra ATA are all terms that describe the older PATA (Parallel ATA) interface.
ATA-150, ATA-300 describes the performance of the newer SATA (serial ATA) interface.
I don't know the specifics of your machine, but if it's more than 3-4 few years old, it probably doesn't have SATA.