Rule #1: there is no such thing as 'the best.' Foolish. There are many things to consider: speed (measurable, not morons who claim Doom3 loads twice as fast), size, reliability (see rule #3), and price.
Rule #2: buy the drive that a) is the size you want b) has the warranty you want and c) most importantly is the price you want. For instance, I don't care what the warranty period is cause I know I won't keep the drive more than a year anyway. As for price, never pay more than fifty (.50) centers per gig. A good deal would be thirty (.30) centers per gig.
Rule #3: nobody can tell you which brand of drive will be most reliable. Period. Anyone who says otherwise is talking out of their a$$ and should be ignored. A lot of worthless anecdotal evidence is thrown around forums like this: "yeah well I had eight Maxtor drives all fail in a row <because I didn't know how to diagnose a faulty power supply, bad RAM, bad motherboard, bad WHATEVER>" and so on. The only assurance you have, from a financial point of view, is to buy a drive that has a nice, fat warranty. You have absolutely no way of guaranteeing reliability beforehand. Which brings us to....
Rule #4: always backup your data. Any drive can fail at any time for any or no reason. No, copying to another hard drive is not backing it up. On a consumer budget, the least expensive thing smart thing you can do is purchase a CDRW/DVDRW and backup to disk. Not perfect, but manageable for most folks.