|I suggest you get an External USB drive. Any capacity you like should work just fine. Doesn't matter if it is IDE or SATA. |
The only caveate is you should be running SP3 for best compatibility.
I recommend you get a 3.5" drive which requires an AC power connection. That type of enclosure is more reliable.
Buying a separate enclosure and drive and assembling it yourself is more expensive than an assembled unit. That said, there are some benefits to going that way.
If a pre-assembled unit dies on you under warranty there is no way to recover data without voiding the warranty. If you assemble your own, each component is warrantied separately so you can remove the drive without warranty issues.
The best enclosures have a cooling fan in them. Heat is the enemy of external drives.
Don't look at an external drive as an upgrade. Look at it as peripheral hardware that will be used on a future computer.
I currently prefer Western Digital hard drives. The 500GB seem to be the sweet spot on cost.
Remember, you should be regularly backing up your personal data. That means TWO copies of personal data in two different locations.
Newegg also has a memory configurator.
Links below are for a drive and enclosure.