My vote is for Hypersonic, but this may be because I have owned three different laptops from them and have had nothing but success with my dealings. I have had to deal with support issues (hard drive that died, artifacting video card, etc), and in those cases, they worked with me and had my system back to me in about 10 days… don't let that bother you. I was in Europe with the Army and so it had to go snail mail through the USPS into the military postal system. That added for the delay.
That said, there is going to be very little difference between the two systems. The bulk of the difference is going to be between the customer service and support. Call both and talk with them and let your experience drive your choice. If there are some concerns you have, make sure you ask about that as well.
In the end, it is going to be a pricey purchase that you have to be happy with. Good luck!