I think that a pre-built computer of an important manufacturer (Such as HP and Dell) is not a wise investment of the money, because of the simple fact that a large part of the price is for this little logo on the front of the case. Since you are practically unlimited in terms of budget, you wouldn't mind paying this money for the logo (I guess).
If the system that you mentioned above supports all the technologies that you mentioned above, and you like the case, buy it. When I replied to you at the beginning it was because I thought you were an "average" user with an "average" budget, that would prefer saving some money, since it's not your case, there isn't any problem with the first system posted.
So, if you would buy it, post if...