The more RAM a system has the better. As a rule of thumb, you should get a hard drive that has a minimum capacity of approximately ten to twenty GigaBytes. The video system in a computer includes both a video card and the computer monitor. 28.8K or 33.6K with data compression are acceptable. Where you purchase a computer system is almost as important as what you buy.
Mail order is a bit better than a generic discount store, but also has some disadvantages.
There also has to be some question as to the stability and long term support available from a mail order vendor.