Need recomendations for a new harddrive.

Potentially retarded questions to follow.

For use with XP, needs to be internal. And I'm gonna be buying it via Dell, so I'm refering to this shit. http://search.dell.com/results.aspx?s=gen&c=us&l=en&k=hard+drives&cat=prod&p=1

How much stats on my comp would you need for a good call on this? Also, I'm willin' to put in a fair amount of cash for this ($300+?), and I want a good one. What sort of specs should I be looking for?

You need to know the interface (99% most likely SATA or ATA) and form factor (again probably 3.5").  Then you have to decide if you want standard speed (7200 rpm) or higher, but be warned that higher speed is much more expensive per Gigabit (like 74 GB vs 500 GB in for the same cost).  The extra rpm speed will make a difference in game loading screens (and even more if you are doing a RAID configuration).  Generally try to get higher cache size whenever you can since it will only be a matter of dollars more.  A larger Cache decreases access time to recently accessed files.  Unlike rpm speed, cache size won't make a difference in loading screens but you if you don't get enough of it you may notice slowdown when managing files and directories.

Don't buy from Dell just because you have a Dell computer.  Dell isn't where you'd want to buy individual components anyways.  Try newegg and you can search exactly for what you want.

http://www.newegg.com/Store/SubCategory.aspx?SubCategory=14&name=Internal-Hard-Drives

Seagate and Western Digital are basically the Coca-cola and Pepsi of hard drives, try buying from them.