Our Compaq Presario 5400US has very limited HD space, and I'd like recommendations for sources of discount pricing (up to $300) on a new computer. It should include at least:

Windows XP (the users are most familiar with this version)
AOL 9.0 (if not, I have the installation disk)
Internet Explorer
100 G HD
DVD ROM
Ethernet
Graphics capability
Adobe Reader

We already have the keyboard, LCD monitor, speakers. However, if anyone can advise on a full system, I'd appreciate it.