I have 29 Dell PC's and have not had any problems with the exception of one failed monitor after seventeen months. I don't think that's too bad.
I would make two points here though.
You are not including a DVD writer. I assume this is intentional.
I don't know what XP Home "Basic" is. Do you mean XP or Vista Basic. Quite honestly I wouldn't bother with XP now, its old news.
I would also double the ram.
The graphics will be on its own card.
When ordered Dell will give you a link from which you can track the building of the machine, and when complete they will give you a second link to the courier (usually Walsh Western) so you can track its delivery progress.