As for D-Sub, I would imagine it comes with an adapter (or it may not even need one)
However, have you considered building yourself?
I would highly recomend it. You'd save some money, learn a little bit, have more fun, and get a higher quality computer. Its not as hard as it sounds. Everything just smoothly fits in only one hole. Theres plenty of tutorials to walk you through it and you can always ask the members here for help.
If you were open to the idea, we could help you pick out the best parts for your money. ( i have to go to bed right now though)