.
I wouldn't buy direct from HP ... they only give a
21 day return window. 
The BEST place to buy is thru COSTCO. 
COSTCO gives a 180 day window : , you be a FOOL to buy from anywhere else. (really)
CTO units (Custom to Order) come DIRECT from the HP factory in CHINA... You receiving the unit 7-10 days from date of order... with the latest hardware revisions... (That reason alone being why you should CTO a machine, instead of buying a "pre-built")
http://www.costco.com/CTO/HPLanding....p=C&ec=&topnav
Before you say a 180 day return window is not an "important" issue for you, read thru this thread and ask these guys if they had wished they had bought thru COSTCO. :
http://forum.notebookreview.com/showthread.php?t=57325
(Little "tip", HP uses the "consumer" line to test out "new" ideas, hardware for their "Business Class" line of products... read that as "consumer" line units may be "buggy", or have problems like noted above.)
Buying thru COSTCO
.... Why COSTCO?
If you get a unit with a "problem" you have a CHOICE of sending it in to HP for "repair"... Or just returning it getting ALL your money back. That's thru COSTCO.... Thru HP after 21-days your STUCK with it.... You get a "model" that is "problematic" and you'll thank me for pointing you to COSTCO as THE place to buy a HP from!!!!
(Note that a unit with a "problem" is DIFFERANT than a unit that is problematic.... Problems can be "fixed", problematic units/models have a problem which cannot be "fixed". See keyboard thread above)
Here's a guide on "How" you should return a unit to COSTCO :
Best place to buy an HP, How to get all your money back, and make sure mfg bears the brunt of the loss, instead of the reseller!http://forum.notebookreview.com/showthread.php?t=86901
One last thing, depending on where you are
COSTCO may not be an "option" for purchase... If that's the case you're on you're own. (Good luck)
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