Connection type should be RJ-45. Frequently Norton or McAfee anti-virus software comes bundled with a computer. If not, Norton is slightly preferred as it is easier to update. Norton is preferred for the Mac. The display will be integral to the computer.
Active matrix is the most expensive and highest quality.
HPDA is a compromise between the two and is suitable for most purposes. Size and quality are personal preference. On-campus students will likely not need a modem as Internet connections are provided in the rooms. If a modem is purchased be sure to get one that adheres, or is upgradeable, to the latest v.90 standard.