laptop hard drive upgrade ?????

the information from the hard drive is: Hitachi Model HTS541640J9SA00 5v 700ma 40GB 5400rpm SATA

I THINK its a 2 1/2" hard drive, but i do not know for sure. i know that i want one that says in the neighborhood of 200GB, and i am fine with the 5400 rpm part, which i would believe should keep the amp draw close to the same as what is in here now. i do not want to have to start messing around with upgrading power supplies or more a powerful battery. what else do i need to know before i order one???
 
i did not see the 16MB cache listed on my hard drive. i am not really sure what that is. is that an industry standard? or could mine be different? also, just below the product description, there is a link to a newer model. which makes me ??? i think that ssd are really nothing more than a lot of ram inside of a case. is that right? which would make it quicker, and more reliable. but i am on a stupid tight budget. so every dollar counts.
 
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