go there,
http://www.sohodiffusion.com/configurpc.asp
(you must use Internet Explorer, it may work with FireFox, but it would be better with Explorer)

build your own computer, with what you want, for your budget, that online store in located in Canada(i think) they ship everywhere in Canada (including Quebec, FINALLY! lol) also in the U.S. and France

you must also know this since you are only 14
PURCHASING BY MINORS [Table of contents]

For the protection of our shoppers, it is our policy to not sell to minors. However, if you are minors and wish to purchase from our web site, have a parent or legal guardian make the purchase for you. Thank you for your comprehension.
you can also see the website in French (in case...)